A new computation scheme proposed to tackle commensurate problems is devel- oped by modifying the semi-analytic approach for minimizing computational complexity. Using the proposed scheme, the limit state equations, u...A new computation scheme proposed to tackle commensurate problems is devel- oped by modifying the semi-analytic approach for minimizing computational complexity. Using the proposed scheme, the limit state equations, usually referred to as the failure surface, are obtained from transformation of an interval variable to a normalized one. In order to minimize the computational cost, two algorithms for optimizing the calculation steps have been proposed. The monotonicity of the objective function can be determined from narrowing the scope of interval variables in normalized infinite space by incorporating the algorithms into the computational scheme. Two examples are used to illustrate the operation and computational efficiency of the approach. The results of these examples show that the proposed algorithms can greatly reduce the computation complexity without sacrificing the computational accuracy. The advantage of the proposed scheme can be even more efficient for analyzing sophistic structures.展开更多
We present the thermal expansion coefficient （TEC） measurement technology of compensating for the effect of variations in the refractive index based on a Nd： YA G laser feedback system, the beam frequency is shifte...We present the thermal expansion coefficient （TEC） measurement technology of compensating for the effect of variations in the refractive index based on a Nd： YA G laser feedback system, the beam frequency is shifted by a pair of aeousto-optic modulators and then the heterodyne phase measurement technique is used. The sample measured is placed in a muffle furnace with two coaxial holes opened on the opposite furnace walls. The measurement beams hit perpendicularly and coaxially on each surface of the sample. The reference beams hit on the reference mirror and the high-refiectivity mirror, respectively. By the heterodyne configuration and computing, the influences of the vibration, distortion of the sample supporter and the effect of variations in the refractive index are measured and largely minimized. For validation, the TECs of aluminum samples are determined in the temperature range of 29-748K, confirming not only the precision within 5 × 10-7 K-1 and the accuracy within 0.4% from 298K to 448K but also the high sensitivity non-contact measurement of the lower reflectivity surface induced by the sample oxidization from 448 K to 748 K.展开更多
The effectiveness of evaluating an investment project based on predicting cash flows depends on the uncertainty of its future cash flows. The remoter the cash flows are, the higher the uncertainty is. Because of this,...The effectiveness of evaluating an investment project based on predicting cash flows depends on the uncertainty of its future cash flows. The remoter the cash flows are, the higher the uncertainty is. Because of this, this paper suggests to discount cash flows by applying risky index of time （RIT）. Thus, the discount rate used to discount the distant cash flows is higher that the discount rate used to discount the near cash flows. By this systematic method, the risk caused by the uncertainty of future cash flows can be hedged in making investment decision. To a certain degree, this approach is reasonable in evaluating investment alternatives under uncertainty. Furthermore, the paper puts forward a practical approach on determining RIT in practice.展开更多
Site index(SI)is determined from the top height development and is a proxy for forest productivity,defined as the expected top height for a given species at a certain index age.In Norway,an index age of 40 years is us...Site index(SI)is determined from the top height development and is a proxy for forest productivity,defined as the expected top height for a given species at a certain index age.In Norway,an index age of 40 years is used.By using bi-temporal airborne laser scanning(ALS)data,SI can be determined using models estimated from SI observed on field plots(the direct approach)or from predicted top heights at two points in time(the height differential approach).Time series of ALS data may enhance SI determination compared to conventional methods used in operational forest inventory by providing more detailed information about the top height development.We used longitudinal data comprising spatially consistent field and ALS data collected from training plots in 1999,2010,and 2022 to determine SI using the direct and height differential approaches using all combinations of years and performed an external validation.We also evaluated the use of data assimilation.Values of root mean square error obtained from external validation were in the ranges of 16.3%–21.4%and 12.8%–20.6%of the mean fieldregistered SI for the direct approach and the height differential approach,respectively.There were no statistically significant effects of time series length or the number of points in time on the obtained accuracies.Data assimilation did not result in any substantial improvement in the obtained accuracies.Although a time series of ALS data did not yield greater accuracies compared to using only two points in time,a larger proportion of the study area could be used in ALS-based determination of SI when a time series was available.This was because areas that were unsuitable for SI determination between two points in time could be subject to SI determination based on data from another part of the time series.展开更多
目的:比较直接前方入路与后外侧入路全髋关节置换术(THA)治疗股骨颈骨折患者的效果。方法:回顾性分析2022年1月至2025年1月该院收治的82例股骨颈骨折患者的临床资料,根据手术入路不同将其分为观察组和对照组各41例。观察组采用直接前方...目的:比较直接前方入路与后外侧入路全髋关节置换术(THA)治疗股骨颈骨折患者的效果。方法:回顾性分析2022年1月至2025年1月该院收治的82例股骨颈骨折患者的临床资料,根据手术入路不同将其分为观察组和对照组各41例。观察组采用直接前方入路THA治疗,对照组采用后外侧入路THA治疗,比较两组手术相关指标[切口长度、住院时间、术中出血量、术后72 h视觉模拟评分法(VAS)评分、术后引流量]水平,手术前后炎性指标[超敏C反应蛋白(hs-CRP)、白细胞介素-1β(IL-1β)、淀粉样蛋白A(SAA)]水平、术后髋关节功能[Charnley髋关节疗效量表(CHS)、Harris髋关节功能量表(HSS)]评分,以及并发症发生率。结果:两组手术时间比较,差异无统计学意义(P>0.05);研究组切口长度、住院时间均短于对照组,术中出血量、术后引流量均少于对照组,术后72 h VAS评分低于对照组,差异有统计学意义(P<0.05);术后3 d,两组hs-CRP、IL-1β、SAA水平均高于术前,但观察组低于对照组,差异有统计学意义(P<0.05);术后1个月,观察组CHS、HHS评分均高于对照组,差异有统计学意义(P<0.05);术后3、6个月,两组CHS、HHS评分均高于术后1个月,但组间比较,差异均无统计学意义(P>0.05);两组并发症发生率比较,差异无统计学意义(P>0.05)。结论:直接前方入路THA治疗股骨颈骨折患者可缩短切口长度和住院时间,减少术中出血量和术后引流量,降低疼痛评分和炎性指标水平,以及提高髋关节功能评分的效果优于后外侧入路THA治疗。展开更多
目的:探讨改良前外侧入路与后外侧入路在胫骨平台后外侧骨折患者切开复位内固定术中的应用效果。方法:回顾性分析244例患者资料,按手术入路分为改良前外侧组与后外侧组,各122例。观察两组手术相关恢复指标、评估两组术后1 w的关节复位...目的:探讨改良前外侧入路与后外侧入路在胫骨平台后外侧骨折患者切开复位内固定术中的应用效果。方法:回顾性分析244例患者资料,按手术入路分为改良前外侧组与后外侧组,各122例。观察两组手术相关恢复指标、评估两组术后1 w的关节复位效果、比较两组术前及术后1 m的膝关节活动度、术后不同时间点的膝关节功能[美国特种外科医院膝关节功能量表(Hospital of Special Surgery,HSS)]变化,记录两组术后并发症发生情况。比较两组术前及术后1 m的血清骨代谢指标[骨钙素(Boneglaprotein,BGP)、I型前胶原羧基端肽(Procollagen Carboxyl Terminal Peptide,PICP)、总Ⅰ型前胶原N端前肽(Total-procollagen type I N-terminal propeptide,Total-PINP)水平及骨吸收标记物Ⅰ型胶原羟基端肽(beta-isomerized C-telopeptide,β-CTX)]水平。结果:相比后外侧组,改良前外侧组手术时间、愈合时间更短,出血量更少(P<0.05);其复位优良率更高(P<0.05);术后1 m膝关节活动度改善更显著(P<0.05);HSS评分随时间提高,组间、时间及交互效应均显著,改良前外侧组在1、3 m评分更高(P<0.05);并发症总发生率更低(P<0.05);术后BGP、PICP升高更显著,Total-PINP、β-CTX降低更明显(P<0.05)。结论:改良前外侧入路可缩短手术及康复时间,减少出血,提高复位质量、关节功能与骨代谢水平,降低并发症发生率,疗效优于后外侧入路。展开更多
Crop seeds are important sources of protein, oil, and carbohydrates for food, animal feeds, and industrial products. Recently, much attention has been paid to quality and functional properties of crop seeds. However, ...Crop seeds are important sources of protein, oil, and carbohydrates for food, animal feeds, and industrial products. Recently, much attention has been paid to quality and functional properties of crop seeds. However, seed traits possess some distinct genetic characteristics in comparison with plant traits, which increase the difficulty of genetically improving these traits. In this study, diallel analysis for seed models with genotype by environment interaction （GE） effect was applied to estimate the variance-covariance components of seed traits. Mixed linear model approaches were used to estimate the genetic covariances between pair-wise seed and plant traits. The breeding values （BV） were divided into two categories for the seed models. The first category of BV was defined as the combination of direct additive, cytoplasmic, and maternal additive effects, which should be utilized for selecting stable cultivars over multi-environments. The three genetic effects, together with their GE interaction, were included in the second category of BV for selecting special lines to be grown in specific ecosystems. Accordingly, two types of selection indices for seed traits, i.e., general selection index and interaction selection index, were developed and constructed on the first and the second category BV, respectively. These proposed selection indices can be applied to solve the difficult task of simultaneously improving multiple seed traits in various environments. Data of crop seeds with regard to four seed traits and four yield traits based on the modified diallel crosses in Upland cotton （Gossypium hirsutum L.） were used as an example for demonstrating the proposed methodology.展开更多
Intensity and variability of droughts are considered inIranduring the period 1951 to 2005. Four variables are considered: the Palmer Drought Severity Index (PDSI), the soil moisture, the temperature and the precipitat...Intensity and variability of droughts are considered inIranduring the period 1951 to 2005. Four variables are considered: the Palmer Drought Severity Index (PDSI), the soil moisture, the temperature and the precipitation (products used for the analysis are downloaded from the NCAR website). Link with the climatic indexLa Ninais also considered (NOAA downloadable products is used). The analysis is based on basic statistical approaches (correlation, linear regressions and Principal Component Analysis). The analysis shows that PDSI is highly correlated to the soil moisture and poorly correlated to the other variables—although the temperature in the warm season shows high correlation to the PDSI and that a severe drought was experienced during 1999-2002 inthe country.展开更多
The paper is devoted to H-optimization problems for linear time invariant(LTI) systems with scalar control, external disturbance and measurement noise. All these problems can be numerically solved with the help of the...The paper is devoted to H-optimization problems for linear time invariant(LTI) systems with scalar control, external disturbance and measurement noise. All these problems can be numerically solved with the help of the well-known universal approaches based on Riccati equations, linear matrix inequalities(LMI) or maximum entropy technique. Nevertheless, in our opinion there exists a possibility to increase the computational efficiency of synthesis using a special spectral approach to the above mentioned problems in frequency domain. Some relevant details are discussed and efficient numerical algorithms are proposed for the practical implementation of spectral approach. One of its virtues is a possibility to present optimal solutions in a specific form, which is convenient for investigation.展开更多
In leading petroleum-producing countries like Kuwait, Brazil, Iran, Iraq and Mexico oil spills frequently occur on land, causing serious damage to crop fields. Soil remediation requires constant monitoring of the poll...In leading petroleum-producing countries like Kuwait, Brazil, Iran, Iraq and Mexico oil spills frequently occur on land, causing serious damage to crop fields. Soil remediation requires constant monitoring of the polluted area. One common monitoring method involves two-dimensional systematic sampling, which can be used to estimate the proportion of the contaminated soil and study the oil spills’ geographic distribution. A well-known issue using this sampling design involves the analytical derivation of variance of the sample mean (proportion), which requires at least two independent samples. To address the problem, this research proposed a variance estimator based on regression and a corrected estimator using the autocorrelation Geary Index under the model-assisted approach. The construction of the estimators was assisted by geo-statistical models by simulating an auxiliary variable. Similar populations to those in real oil spills were recreated, and the accuracy of proposed estimators was evaluated by comparing their performance with other well-known estimators. The factors considered in this simulation study were: a) the model for simulating the populations (exponential and wave), b) the mean and the variance of the process, c) the level of autocorrelation among units. Given the statistical and computing burdens (bias, ratio between estimated and real variance, convergence and computer time), under the exponential model, the regression estimator showed the best performance;and for the wave model, the corrected version performed even better.展开更多
The compressive strength of concrete is one of most important mechanical parameters in the performance assessment of existing reinforced concrete structures.According to various international codes,core samples are dr...The compressive strength of concrete is one of most important mechanical parameters in the performance assessment of existing reinforced concrete structures.According to various international codes,core samples are drilled and tested to obtain the concrete compressive strengths.Non-destructive testing is an important alternative when destructive testing is not feasible without damaging the structure.The commonly used non-destructive testing(NDT)methods to estimate the in-situ values include the Rebound hammer test and the Ultrasonic Pulse Velocity test.The poor reliability of these tests due to different aspects could be partially contrasted by using both methods together,as proposed.in the SonReb method.There are three techniques that are commonly used to predict the compressive strength of concrete based on the SonReb measurements:computational modeling,artificial intelligence,and parametric multi-variable regression models.In a previous study the accuracy of the correlation formulas deduced from the last technique has been investigated in comparison with the effective compressive strengths based on destructive test results on core drilled in adjacent locations.The aim of this study is to verify the accuracy of Artificial Neural Approach comparing the estimated compressive strengths based on NDT measured parameters with the same effective compressive strengths.The comparisons show the best performance of ANN approach.展开更多
基金supported by the National Natural Science Foundation of China (No.10972084)
文摘A new computation scheme proposed to tackle commensurate problems is devel- oped by modifying the semi-analytic approach for minimizing computational complexity. Using the proposed scheme, the limit state equations, usually referred to as the failure surface, are obtained from transformation of an interval variable to a normalized one. In order to minimize the computational cost, two algorithms for optimizing the calculation steps have been proposed. The monotonicity of the objective function can be determined from narrowing the scope of interval variables in normalized infinite space by incorporating the algorithms into the computational scheme. Two examples are used to illustrate the operation and computational efficiency of the approach. The results of these examples show that the proposed algorithms can greatly reduce the computation complexity without sacrificing the computational accuracy. The advantage of the proposed scheme can be even more efficient for analyzing sophistic structures.
基金Supported by the National Natural Science Foundation of China under Grant No F050306
文摘We present the thermal expansion coefficient （TEC） measurement technology of compensating for the effect of variations in the refractive index based on a Nd： YA G laser feedback system, the beam frequency is shifted by a pair of aeousto-optic modulators and then the heterodyne phase measurement technique is used. The sample measured is placed in a muffle furnace with two coaxial holes opened on the opposite furnace walls. The measurement beams hit perpendicularly and coaxially on each surface of the sample. The reference beams hit on the reference mirror and the high-refiectivity mirror, respectively. By the heterodyne configuration and computing, the influences of the vibration, distortion of the sample supporter and the effect of variations in the refractive index are measured and largely minimized. For validation, the TECs of aluminum samples are determined in the temperature range of 29-748K, confirming not only the precision within 5 × 10-7 K-1 and the accuracy within 0.4% from 298K to 448K but also the high sensitivity non-contact measurement of the lower reflectivity surface induced by the sample oxidization from 448 K to 748 K.
文摘The effectiveness of evaluating an investment project based on predicting cash flows depends on the uncertainty of its future cash flows. The remoter the cash flows are, the higher the uncertainty is. Because of this, this paper suggests to discount cash flows by applying risky index of time （RIT）. Thus, the discount rate used to discount the distant cash flows is higher that the discount rate used to discount the near cash flows. By this systematic method, the risk caused by the uncertainty of future cash flows can be hedged in making investment decision. To a certain degree, this approach is reasonable in evaluating investment alternatives under uncertainty. Furthermore, the paper puts forward a practical approach on determining RIT in practice.
基金part of the Centre for Research-based Innovation SmartForest:Bringing Industry 4.0 to the Norwegian forest sector(NFR SFI project no.309671,smartforest.no)。
文摘Site index(SI)is determined from the top height development and is a proxy for forest productivity,defined as the expected top height for a given species at a certain index age.In Norway,an index age of 40 years is used.By using bi-temporal airborne laser scanning(ALS)data,SI can be determined using models estimated from SI observed on field plots(the direct approach)or from predicted top heights at two points in time(the height differential approach).Time series of ALS data may enhance SI determination compared to conventional methods used in operational forest inventory by providing more detailed information about the top height development.We used longitudinal data comprising spatially consistent field and ALS data collected from training plots in 1999,2010,and 2022 to determine SI using the direct and height differential approaches using all combinations of years and performed an external validation.We also evaluated the use of data assimilation.Values of root mean square error obtained from external validation were in the ranges of 16.3%–21.4%and 12.8%–20.6%of the mean fieldregistered SI for the direct approach and the height differential approach,respectively.There were no statistically significant effects of time series length or the number of points in time on the obtained accuracies.Data assimilation did not result in any substantial improvement in the obtained accuracies.Although a time series of ALS data did not yield greater accuracies compared to using only two points in time,a larger proportion of the study area could be used in ALS-based determination of SI when a time series was available.This was because areas that were unsuitable for SI determination between two points in time could be subject to SI determination based on data from another part of the time series.
文摘目的:比较直接前方入路与后外侧入路全髋关节置换术(THA)治疗股骨颈骨折患者的效果。方法:回顾性分析2022年1月至2025年1月该院收治的82例股骨颈骨折患者的临床资料,根据手术入路不同将其分为观察组和对照组各41例。观察组采用直接前方入路THA治疗,对照组采用后外侧入路THA治疗,比较两组手术相关指标[切口长度、住院时间、术中出血量、术后72 h视觉模拟评分法(VAS)评分、术后引流量]水平,手术前后炎性指标[超敏C反应蛋白(hs-CRP)、白细胞介素-1β(IL-1β)、淀粉样蛋白A(SAA)]水平、术后髋关节功能[Charnley髋关节疗效量表(CHS)、Harris髋关节功能量表(HSS)]评分,以及并发症发生率。结果:两组手术时间比较,差异无统计学意义(P>0.05);研究组切口长度、住院时间均短于对照组,术中出血量、术后引流量均少于对照组,术后72 h VAS评分低于对照组,差异有统计学意义(P<0.05);术后3 d,两组hs-CRP、IL-1β、SAA水平均高于术前,但观察组低于对照组,差异有统计学意义(P<0.05);术后1个月,观察组CHS、HHS评分均高于对照组,差异有统计学意义(P<0.05);术后3、6个月,两组CHS、HHS评分均高于术后1个月,但组间比较,差异均无统计学意义(P>0.05);两组并发症发生率比较,差异无统计学意义(P>0.05)。结论:直接前方入路THA治疗股骨颈骨折患者可缩短切口长度和住院时间,减少术中出血量和术后引流量,降低疼痛评分和炎性指标水平,以及提高髋关节功能评分的效果优于后外侧入路THA治疗。
文摘目的:探讨改良前外侧入路与后外侧入路在胫骨平台后外侧骨折患者切开复位内固定术中的应用效果。方法:回顾性分析244例患者资料,按手术入路分为改良前外侧组与后外侧组,各122例。观察两组手术相关恢复指标、评估两组术后1 w的关节复位效果、比较两组术前及术后1 m的膝关节活动度、术后不同时间点的膝关节功能[美国特种外科医院膝关节功能量表(Hospital of Special Surgery,HSS)]变化,记录两组术后并发症发生情况。比较两组术前及术后1 m的血清骨代谢指标[骨钙素(Boneglaprotein,BGP)、I型前胶原羧基端肽(Procollagen Carboxyl Terminal Peptide,PICP)、总Ⅰ型前胶原N端前肽(Total-procollagen type I N-terminal propeptide,Total-PINP)水平及骨吸收标记物Ⅰ型胶原羟基端肽(beta-isomerized C-telopeptide,β-CTX)]水平。结果:相比后外侧组,改良前外侧组手术时间、愈合时间更短,出血量更少(P<0.05);其复位优良率更高(P<0.05);术后1 m膝关节活动度改善更显著(P<0.05);HSS评分随时间提高,组间、时间及交互效应均显著,改良前外侧组在1、3 m评分更高(P<0.05);并发症总发生率更低(P<0.05);术后BGP、PICP升高更显著,Total-PINP、β-CTX降低更明显(P<0.05)。结论:改良前外侧入路可缩短手术及康复时间,减少出血,提高复位质量、关节功能与骨代谢水平,降低并发症发生率,疗效优于后外侧入路。
基金supported by the National Basic Research Program of China (No. 2006CB101708)National Science and Technology Supporting Item of China (No. 2006BAD10A00).
文摘Crop seeds are important sources of protein, oil, and carbohydrates for food, animal feeds, and industrial products. Recently, much attention has been paid to quality and functional properties of crop seeds. However, seed traits possess some distinct genetic characteristics in comparison with plant traits, which increase the difficulty of genetically improving these traits. In this study, diallel analysis for seed models with genotype by environment interaction （GE） effect was applied to estimate the variance-covariance components of seed traits. Mixed linear model approaches were used to estimate the genetic covariances between pair-wise seed and plant traits. The breeding values （BV） were divided into two categories for the seed models. The first category of BV was defined as the combination of direct additive, cytoplasmic, and maternal additive effects, which should be utilized for selecting stable cultivars over multi-environments. The three genetic effects, together with their GE interaction, were included in the second category of BV for selecting special lines to be grown in specific ecosystems. Accordingly, two types of selection indices for seed traits, i.e., general selection index and interaction selection index, were developed and constructed on the first and the second category BV, respectively. These proposed selection indices can be applied to solve the difficult task of simultaneously improving multiple seed traits in various environments. Data of crop seeds with regard to four seed traits and four yield traits based on the modified diallel crosses in Upland cotton （Gossypium hirsutum L.） were used as an example for demonstrating the proposed methodology.
文摘Intensity and variability of droughts are considered inIranduring the period 1951 to 2005. Four variables are considered: the Palmer Drought Severity Index (PDSI), the soil moisture, the temperature and the precipitation (products used for the analysis are downloaded from the NCAR website). Link with the climatic indexLa Ninais also considered (NOAA downloadable products is used). The analysis is based on basic statistical approaches (correlation, linear regressions and Principal Component Analysis). The analysis shows that PDSI is highly correlated to the soil moisture and poorly correlated to the other variables—although the temperature in the warm season shows high correlation to the PDSI and that a severe drought was experienced during 1999-2002 inthe country.
基金supported by the Russian Foundation for Basic Research (RFBR), that controlled by the Government of Russian Federation (No. 17-07-00361)
文摘The paper is devoted to H-optimization problems for linear time invariant(LTI) systems with scalar control, external disturbance and measurement noise. All these problems can be numerically solved with the help of the well-known universal approaches based on Riccati equations, linear matrix inequalities(LMI) or maximum entropy technique. Nevertheless, in our opinion there exists a possibility to increase the computational efficiency of synthesis using a special spectral approach to the above mentioned problems in frequency domain. Some relevant details are discussed and efficient numerical algorithms are proposed for the practical implementation of spectral approach. One of its virtues is a possibility to present optimal solutions in a specific form, which is convenient for investigation.
文摘In leading petroleum-producing countries like Kuwait, Brazil, Iran, Iraq and Mexico oil spills frequently occur on land, causing serious damage to crop fields. Soil remediation requires constant monitoring of the polluted area. One common monitoring method involves two-dimensional systematic sampling, which can be used to estimate the proportion of the contaminated soil and study the oil spills’ geographic distribution. A well-known issue using this sampling design involves the analytical derivation of variance of the sample mean (proportion), which requires at least two independent samples. To address the problem, this research proposed a variance estimator based on regression and a corrected estimator using the autocorrelation Geary Index under the model-assisted approach. The construction of the estimators was assisted by geo-statistical models by simulating an auxiliary variable. Similar populations to those in real oil spills were recreated, and the accuracy of proposed estimators was evaluated by comparing their performance with other well-known estimators. The factors considered in this simulation study were: a) the model for simulating the populations (exponential and wave), b) the mean and the variance of the process, c) the level of autocorrelation among units. Given the statistical and computing burdens (bias, ratio between estimated and real variance, convergence and computer time), under the exponential model, the regression estimator showed the best performance;and for the wave model, the corrected version performed even better.
文摘The compressive strength of concrete is one of most important mechanical parameters in the performance assessment of existing reinforced concrete structures.According to various international codes,core samples are drilled and tested to obtain the concrete compressive strengths.Non-destructive testing is an important alternative when destructive testing is not feasible without damaging the structure.The commonly used non-destructive testing(NDT)methods to estimate the in-situ values include the Rebound hammer test and the Ultrasonic Pulse Velocity test.The poor reliability of these tests due to different aspects could be partially contrasted by using both methods together,as proposed.in the SonReb method.There are three techniques that are commonly used to predict the compressive strength of concrete based on the SonReb measurements:computational modeling,artificial intelligence,and parametric multi-variable regression models.In a previous study the accuracy of the correlation formulas deduced from the last technique has been investigated in comparison with the effective compressive strengths based on destructive test results on core drilled in adjacent locations.The aim of this study is to verify the accuracy of Artificial Neural Approach comparing the estimated compressive strengths based on NDT measured parameters with the same effective compressive strengths.The comparisons show the best performance of ANN approach.
