An estimation method for aircraft similarity based on fuzzy theory and grey incidence analysis is presented. This estimation method is made up of the triangular fuzzy transforming model of linguistic variables and the...An estimation method for aircraft similarity based on fuzzy theory and grey incidence analysis is presented. This estimation method is made up of the triangular fuzzy transforming model of linguistic variables and the method of grey incidence analysis. Nine feature attributes of aircraft are selected to estimate the similarity between the new aircraft and the existing aircraft. A new aircraft X and other six existing aircrafts are taken as examples. Analyses show that similarity estimation results obtained from the method are in accordance with practice.展开更多
The aim was to explore dynamic changes of organic matter and nitrogen pol ution in Dongchang Lake. [Method] Monitoring data, including BOD5, CODCr, NH3-N and TN, of Dongchang Lake were chosen for analysis during 2002-...The aim was to explore dynamic changes of organic matter and nitrogen pol ution in Dongchang Lake. [Method] Monitoring data, including BOD5, CODCr, NH3-N and TN, of Dongchang Lake were chosen for analysis during 2002-2011. [Result] Water quality of the six lake districts showed deteriorating in monitor-ing period, and TN was the dominant pol ution factor; BOD5/CODCr ratio was low, suggesting biodegradability of organic pol utant in the lake was lower. NH3/TN ratio was higher, indicating NH3-N was a major factor causing nitrogen exceeding in 2010. In addition, correlations between BOD5 and CODCr and between NH3-N and TN in the lake districts maintained at a significant level. [Conclusion] The research provides references for improving water in Dongchang Lake.展开更多
The theory of grey systems is a new technique for performing prediction, relational analysis and decision making in many areas. The grey relational analysis was used to optimize the deep-drawing process parameters wit...The theory of grey systems is a new technique for performing prediction, relational analysis and decision making in many areas. The grey relational analysis was used to optimize the deep-drawing process parameters with considerations of the multiple response (the wrinkle, crack and thinning variation). The deep-drawing parame- ters, such as the blank holding force (Fhh), the radii of punch and die (R1.R2), the coefficients of friction (μ1,μ2,μ3) are considered. An orthogonal array is used for the experimental design. The multiple response values are ob- tained making use of finite element analysis (FEA). Optimal process parameters are determined by the grey rela- tional grade obtained from the grey relational analysis for multi-performance characteristics (the wrinkle, crack and the thinning). The analysis of variance (ANOVA) for the grey relational grade is implemented. The results show that the quality of stamped parts can be improved effectively through the new approach. The grey relational analysis can be applied in sheet metal forming.展开更多
By decomposing complex issues into factors at all levels, Grey Relativity Analysis (GRA) can effectively calculate the degree the main factors affect the goal value, and overcome the problems that the traditional ...By decomposing complex issues into factors at all levels, Grey Relativity Analysis (GRA) can effectively calculate the degree the main factors affect the goal value, and overcome the problems that the traditional mathematical statistics have such as big samples, heavy computation, and inconsistency between quantitative results and qualitative analysis. So it becomes one kind of simple, convenient and distinctive systematic analysis method. GRA is applied to corporate crisis early warning analysis. The paper through the GRA the half of this quantitative approach, explores the correlation degree among the corporate crisis early warning factors, in order to find the importance sequence of instance enterprise early warning crisis factors by calculation so as to provide a theoretical foundation for the prevention and decrease of the instance enterprise crisis.展开更多
It has been widely believed that trust is the basis for on-line trading by both academia and practice. The process of f initial trust formation is a dynamic and repeated process. In the electric business environment, ...It has been widely believed that trust is the basis for on-line trading by both academia and practice. The process of f initial trust formation is a dynamic and repeated process. In the electric business environment, this work chose to research the first phase of the process, which is initial trust. The Writer established dynamic model of initial trust formation biased on theory of planned behavior with other theories, such as TAM and social exchange theory, after micro-analyzing this formation mechanism from. in order to confirming effectiveness of the dynamic model, the writer adopted empirical study, from which writer got an order of. From the result of empirical study, we got the strength order of main factors that can influence the establishment of initial trust.展开更多
The finite element(FE)-based simulation of welding characteristics was carried out to explore the relationship among welding assembly properties for the parallel T-shaped thin-walled parts of an antenna structure.The ...The finite element(FE)-based simulation of welding characteristics was carried out to explore the relationship among welding assembly properties for the parallel T-shaped thin-walled parts of an antenna structure.The effects of welding direction,clamping,fixture release time,fixed constraints,and welding sequences on these properties were analyzed,and the mapping relationship among welding characteristics was thoroughly examined.Different machine learning algorithms,including the generalized regression neural network(GRNN),wavelet neural network(WNN),and fuzzy neural network(FNN),are used to predict the multiple welding properties of thin-walled parts to mirror their variation trend and verify the correctness of the mapping relationship.Compared with those from GRNN and WNN,the maximum mean relative errors for the predicted values of deformation,temperature,and residual stress with FNN were less than 4.8%,1.4%,and 4.4%,respectively.These results indicate that FNN generated the best predicted welding characteristics.Analysis under various welding conditions also shows a mapping relationship among welding deformation,temperature,and residual stress over a period of time.This finding further provides a paramount basis for the control of welding assembly errors of an antenna structure in the future.展开更多
While there are several research studies that planned to discover what drives students' motivation to learn English as a foreign/second language, to our knowledge there have been no pragmatic studies in the field of ...While there are several research studies that planned to discover what drives students' motivation to learn English as a foreign/second language, to our knowledge there have been no pragmatic studies in the field of EFL that examined Sudanese college-level students learning motivation. This study, therefore, intends to investigate Sudanese college-level students' motivation and its correlation to student's achievement. With strong emphasis on motivation, this study is, also examining the relationship between students' motivation and achievement when learning English as foreign language. The participants in this study were college-level students in Sudan. The data was collected from 60 college level students. This quantitative study employed both Pearson Correlation methods of analysis as well as ANOVA Regression analysis. The results of this study revealed that there is strong correlation between students' motivation and students' achievement.展开更多
Large deviations estimates for Poisson processes estimate the logarithm of rare events associated to a Poisson process which has more and more jump which are smaller and smaller. In stochastic analysis, they are valid...Large deviations estimates for Poisson processes estimate the logarithm of rare events associated to a Poisson process which has more and more jump which are smaller and smaller. In stochastic analysis, they are valid on the whole path space. Asoociated to this jump process is a Markov semi-group. We translate in semi group theory the proof of Wentzel-Freidlin for these estimates by translating in semi-group theory some basical tools of stochastic analysis as the exponential martingales of stochastic analysis. These Wentzel-Freidlin estimates (upper-bound) are only true for the semi-group.展开更多
The information access is the rich data available for information retrieval, evolved to provide principle approaches or strategies for searching. For building the successful web retrieval search engine model, there ar...The information access is the rich data available for information retrieval, evolved to provide principle approaches or strategies for searching. For building the successful web retrieval search engine model, there are a number of prospects that arise at the different levels where techniques, such as Usenet, support vector machine are employed to have a significant impact. The present investigations explore the number of problems identified its level and related to finding information on web. The authors have attempted to examine the issues and prospects by applying different methods such as web graph analysis, the retrieval and analysis of newsgroup postings and statistical methods for inferring meaning in text. The proposed model thus assists the users in finding the existing formation of data they need. The study proposes three heuristics model to characterize the balancing between query and feedback information, so that adaptive relevance feedback. The authors have made an attempt to discuss the parameter factors that are responsible for the efficient searching. The important parameters can be taken care of for the future extension or development of search engines.展开更多
Objective: To simplify the TCM pattern of the zang-fu organs. Methods: A database of zang-fu syndromes was established. The relationship between the zang-fu syndromes was analyzed by means of frequency analysis, assoc...Objective: To simplify the TCM pattern of the zang-fu organs. Methods: A database of zang-fu syndromes was established. The relationship between the zang-fu syndromes was analyzed by means of frequency analysis, association rule, and ф-coefficient correlation. Results: The six zang-fu organs of the heart, liver, spleen, lung, kidney, and stomach prove to be the main components of the zang-fu pattern. The large intestine, small intestine, gallbladder, bladder, triple energizer, and pericardium have strong association and positive correlation with the above-mentioned six zang-fu organs, and their clinical symptoms can all be included into the symptoms of these six zang-fu organs. Conclusion: The traditional TCM pattern of six-zang and six-fu can be simplified into five-zang and one-fu.展开更多
The cascade algorithm plays an important role in computer graphics and wavelet analysis.In this paper,we first investigate the convergence of cascade algorithms associated with a polynomially decaying mask and a gener...The cascade algorithm plays an important role in computer graphics and wavelet analysis.In this paper,we first investigate the convergence of cascade algorithms associated with a polynomially decaying mask and a general dilation matrix in L p (R s) (1 p ∞) spaces,and then we give an error estimate of the cascade algorithms associated with truncated masks.It is proved that under some appropriate conditions if the cascade algorithm associated with a polynomially decaying mask converges in the L p-norm,then the cascade algorithms associated with the truncated masks also converge in the L p-norm.Moreover,the error between the two resulting limit functions is estimated in terms of the masks.展开更多
To obtain effective surface morphology to control surface wettability, this work investigated the influence of protuberant and concave morphology, which are respectively represented by circle-dimpled and micro-square-...To obtain effective surface morphology to control surface wettability, this work investigated the influence of protuberant and concave morphology, which are respectively represented by circle-dimpled and micro-square-convex morphology, on surface wettability. The geometric morphologies were processed on silicon carbide (SIC) surfaces by a laser-marking machine, and surface wettability was monitored by the measurement of contact angles using the sessile drop method. Correlation analysis between contact angles and morphology parameters was conducted to determine the extent of influence. The results showed that the circle-dimpled diameter had a signific^mt influence on surface wettability, whereas grooved width did not. Additionally the depth of dimples and grooves exerted less influence on controlling wetting behaviors. In addition, surface wettability transformed from a superhydrophilic state to a hydrophobic state on micro-square-convex surfaces; contact angles on cir- cle-dimpled surfaces showed a relatively slow transformation, though the surface wettability also underwent the state change.展开更多
文摘An estimation method for aircraft similarity based on fuzzy theory and grey incidence analysis is presented. This estimation method is made up of the triangular fuzzy transforming model of linguistic variables and the method of grey incidence analysis. Nine feature attributes of aircraft are selected to estimate the similarity between the new aircraft and the existing aircraft. A new aircraft X and other six existing aircrafts are taken as examples. Analyses show that similarity estimation results obtained from the method are in accordance with practice.
基金Supported by Major Science and Technology Program for Water Pollution Control and Treatment(2009ZX07106-03)Shandong Provincial Natural Science Foundation(ZR2013DM012,ZR2010DL008,ZR2013DL005)Undergraduate Scientific and Technological Innovation Project(SF2013138,SF2013140,SF2012076,SF2012077,SF2012090)~~
文摘The aim was to explore dynamic changes of organic matter and nitrogen pol ution in Dongchang Lake. [Method] Monitoring data, including BOD5, CODCr, NH3-N and TN, of Dongchang Lake were chosen for analysis during 2002-2011. [Result] Water quality of the six lake districts showed deteriorating in monitor-ing period, and TN was the dominant pol ution factor; BOD5/CODCr ratio was low, suggesting biodegradability of organic pol utant in the lake was lower. NH3/TN ratio was higher, indicating NH3-N was a major factor causing nitrogen exceeding in 2010. In addition, correlations between BOD5 and CODCr and between NH3-N and TN in the lake districts maintained at a significant level. [Conclusion] The research provides references for improving water in Dongchang Lake.
基金The National Natural Science Foundation of China (No50475020)
文摘The theory of grey systems is a new technique for performing prediction, relational analysis and decision making in many areas. The grey relational analysis was used to optimize the deep-drawing process parameters with considerations of the multiple response (the wrinkle, crack and thinning variation). The deep-drawing parame- ters, such as the blank holding force (Fhh), the radii of punch and die (R1.R2), the coefficients of friction (μ1,μ2,μ3) are considered. An orthogonal array is used for the experimental design. The multiple response values are ob- tained making use of finite element analysis (FEA). Optimal process parameters are determined by the grey rela- tional grade obtained from the grey relational analysis for multi-performance characteristics (the wrinkle, crack and the thinning). The analysis of variance (ANOVA) for the grey relational grade is implemented. The results show that the quality of stamped parts can be improved effectively through the new approach. The grey relational analysis can be applied in sheet metal forming.
文摘By decomposing complex issues into factors at all levels, Grey Relativity Analysis (GRA) can effectively calculate the degree the main factors affect the goal value, and overcome the problems that the traditional mathematical statistics have such as big samples, heavy computation, and inconsistency between quantitative results and qualitative analysis. So it becomes one kind of simple, convenient and distinctive systematic analysis method. GRA is applied to corporate crisis early warning analysis. The paper through the GRA the half of this quantitative approach, explores the correlation degree among the corporate crisis early warning factors, in order to find the importance sequence of instance enterprise early warning crisis factors by calculation so as to provide a theoretical foundation for the prevention and decrease of the instance enterprise crisis.
文摘It has been widely believed that trust is the basis for on-line trading by both academia and practice. The process of f initial trust formation is a dynamic and repeated process. In the electric business environment, this work chose to research the first phase of the process, which is initial trust. The Writer established dynamic model of initial trust formation biased on theory of planned behavior with other theories, such as TAM and social exchange theory, after micro-analyzing this formation mechanism from. in order to confirming effectiveness of the dynamic model, the writer adopted empirical study, from which writer got an order of. From the result of empirical study, we got the strength order of main factors that can influence the establishment of initial trust.
基金The Natural Science Foundation of Jiangsu Province,China(No.BK20200470)China Postdoctoral Science Foundation(No.2021M691595)Innovation and Entrepreneurship Plan Talent Program of Jiangsu Province(No.AD99002).
文摘The finite element(FE)-based simulation of welding characteristics was carried out to explore the relationship among welding assembly properties for the parallel T-shaped thin-walled parts of an antenna structure.The effects of welding direction,clamping,fixture release time,fixed constraints,and welding sequences on these properties were analyzed,and the mapping relationship among welding characteristics was thoroughly examined.Different machine learning algorithms,including the generalized regression neural network(GRNN),wavelet neural network(WNN),and fuzzy neural network(FNN),are used to predict the multiple welding properties of thin-walled parts to mirror their variation trend and verify the correctness of the mapping relationship.Compared with those from GRNN and WNN,the maximum mean relative errors for the predicted values of deformation,temperature,and residual stress with FNN were less than 4.8%,1.4%,and 4.4%,respectively.These results indicate that FNN generated the best predicted welding characteristics.Analysis under various welding conditions also shows a mapping relationship among welding deformation,temperature,and residual stress over a period of time.This finding further provides a paramount basis for the control of welding assembly errors of an antenna structure in the future.
文摘While there are several research studies that planned to discover what drives students' motivation to learn English as a foreign/second language, to our knowledge there have been no pragmatic studies in the field of EFL that examined Sudanese college-level students learning motivation. This study, therefore, intends to investigate Sudanese college-level students' motivation and its correlation to student's achievement. With strong emphasis on motivation, this study is, also examining the relationship between students' motivation and achievement when learning English as foreign language. The participants in this study were college-level students in Sudan. The data was collected from 60 college level students. This quantitative study employed both Pearson Correlation methods of analysis as well as ANOVA Regression analysis. The results of this study revealed that there is strong correlation between students' motivation and students' achievement.
文摘Large deviations estimates for Poisson processes estimate the logarithm of rare events associated to a Poisson process which has more and more jump which are smaller and smaller. In stochastic analysis, they are valid on the whole path space. Asoociated to this jump process is a Markov semi-group. We translate in semi group theory the proof of Wentzel-Freidlin for these estimates by translating in semi-group theory some basical tools of stochastic analysis as the exponential martingales of stochastic analysis. These Wentzel-Freidlin estimates (upper-bound) are only true for the semi-group.
文摘The information access is the rich data available for information retrieval, evolved to provide principle approaches or strategies for searching. For building the successful web retrieval search engine model, there are a number of prospects that arise at the different levels where techniques, such as Usenet, support vector machine are employed to have a significant impact. The present investigations explore the number of problems identified its level and related to finding information on web. The authors have attempted to examine the issues and prospects by applying different methods such as web graph analysis, the retrieval and analysis of newsgroup postings and statistical methods for inferring meaning in text. The proposed model thus assists the users in finding the existing formation of data they need. The study proposes three heuristics model to characterize the balancing between query and feedback information, so that adaptive relevance feedback. The authors have made an attempt to discuss the parameter factors that are responsible for the efficient searching. The important parameters can be taken care of for the future extension or development of search engines.
基金Supported by the National Fund Supporting Project of Natural Science (No.30772695)National Supporting Plan for Science and Technology in "The 11th Five-year Plan" (No.2006 BAI08B01-05)National Major Special Subject of Science and Technology (No.2009ZX10005-019)
文摘Objective: To simplify the TCM pattern of the zang-fu organs. Methods: A database of zang-fu syndromes was established. The relationship between the zang-fu syndromes was analyzed by means of frequency analysis, association rule, and ф-coefficient correlation. Results: The six zang-fu organs of the heart, liver, spleen, lung, kidney, and stomach prove to be the main components of the zang-fu pattern. The large intestine, small intestine, gallbladder, bladder, triple energizer, and pericardium have strong association and positive correlation with the above-mentioned six zang-fu organs, and their clinical symptoms can all be included into the symptoms of these six zang-fu organs. Conclusion: The traditional TCM pattern of six-zang and six-fu can be simplified into five-zang and one-fu.
基金supported by National Natural Science Foundation of China (GrantNos. 11101120,11001247)the Natural Science Foundation of Hohai University (Grant No. 2011B10714)+1 种基金supported by National Natural Science Foundation of China (Grant Nos. 11171299,10971189)the Natural Science Foundation of Zhejiang Province of China (Grant No. Y6090091)
文摘The cascade algorithm plays an important role in computer graphics and wavelet analysis.In this paper,we first investigate the convergence of cascade algorithms associated with a polynomially decaying mask and a general dilation matrix in L p (R s) (1 p ∞) spaces,and then we give an error estimate of the cascade algorithms associated with truncated masks.It is proved that under some appropriate conditions if the cascade algorithm associated with a polynomially decaying mask converges in the L p-norm,then the cascade algorithms associated with the truncated masks also converge in the L p-norm.Moreover,the error between the two resulting limit functions is estimated in terms of the masks.
基金supported by the National Natural Science Foundation of China(Grant No.51275473)the Zhejiang Provincial Natural Science Foundation of China(Grant No.LR14E050001)the Tribology Science Fund of State Key Laboratory of Tribology of China(Grant No.SKLTKF14B13)
文摘To obtain effective surface morphology to control surface wettability, this work investigated the influence of protuberant and concave morphology, which are respectively represented by circle-dimpled and micro-square-convex morphology, on surface wettability. The geometric morphologies were processed on silicon carbide (SIC) surfaces by a laser-marking machine, and surface wettability was monitored by the measurement of contact angles using the sessile drop method. Correlation analysis between contact angles and morphology parameters was conducted to determine the extent of influence. The results showed that the circle-dimpled diameter had a signific^mt influence on surface wettability, whereas grooved width did not. Additionally the depth of dimples and grooves exerted less influence on controlling wetting behaviors. In addition, surface wettability transformed from a superhydrophilic state to a hydrophobic state on micro-square-convex surfaces; contact angles on cir- cle-dimpled surfaces showed a relatively slow transformation, though the surface wettability also underwent the state change.