To investigate the process of information technology （IT） impacts on firm competitiveness, an integrated process model of IT impacts on firm competitiveness is brought forward based on the process-oriented view, the...To investigate the process of information technology （IT） impacts on firm competitiveness, an integrated process model of IT impacts on firm competitiveness is brought forward based on the process-oriented view, the resource-based view and the complementary resource view, which is comprised of an IT conversion process, an information system （IS） adoption process, an IS use process and a competition process. The application capability of IT plays the critical role, which determines the efficiency and effectiveness of the aforementioned four processes. The process model of IT impacts on firm competitiveness can also be used to explain why, under what situations and how IT can generate positive organizational outcomes, as well as theoretical bases for further empirical study.展开更多
Remote monitoring of tools for prediction of tool wear in cutting processes was considered, and a method of implementation of a remote-monitoring system previously developed was proposed. Sensor signals were received ...Remote monitoring of tools for prediction of tool wear in cutting processes was considered, and a method of implementation of a remote-monitoring system previously developed was proposed. Sensor signals were received and tool wear was predicted in the local system using an ART2 algorithm, while the monitoring result was transferred to the remote system via intemet. The monitoring system was installed at an on-site machine tool for monitoring three kinds of tools cutting titanium alloys, and the tool wear was evaluated on the basis of vigilances, similarities between vibration signals received and the normal patterns previously trained. A number of experiments were carried out to evaluate the performance of the proposed system, and the results show that the wears of finishing-cut tools are successfully detected when the moving average vigilance becomes lower than the critical vigilance, thus the appropriate tool replacement time is notified before the breakage.展开更多
Based on advantages of technology of distributive fiber-optic temperature sensing and specific to its applications in monitoring mine conflagration, the corresponding Processes such as connection arrangement, signal t...Based on advantages of technology of distributive fiber-optic temperature sensing and specific to its applications in monitoring mine conflagration, the corresponding Processes such as connection arrangement, signal transmission and monitoring were illustrated. As applied in Sitai Coal Mine of Datong Coal Mine Group Co., this method is effective and accurate and could provide reliable gist for monitoring spontaneous combustion in gob area of mines.展开更多
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 ...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 error.Then 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.展开更多
Since the development of the market economy in our country, the information technology has a very far-reaching impact on development, in the process of social and economic operation,, different departments made its or...Since the development of the market economy in our country, the information technology has a very far-reaching impact on development, in the process of social and economic operation,, different departments made its original operating mechanism changed according to their characteristics. However, for the tourism industry, the rapid development of the tourism industry has made the structure of the tourism industry restructure, the wide application of tourism e-commerce is one of the most typical performance. Tourism industry has the characteristics of the application of electronic commerce. Such as remote service, multi volume, low transaction amount and so on, the application of information technology in the tourism industry has led to the rapid development of tourism e-commerce, at the same time, it had changed the competition structure among the tourism enterprise. Seen from the current situation of e-conmaerce in China, there are still a lot of deficiencies and shortcomings in the international tourism industry. Based on the goal of China＇ s tourism development, carry out the development of tourism e-commerce is the first priority of the tourism industry.展开更多
We study the smooth-pasting property for a class of conditional expectations with reflected Levy process as underlying state process. A relationship between local times and regulators for the doubly reflected Levy pro...We study the smooth-pasting property for a class of conditional expectations with reflected Levy process as underlying state process. A relationship between local times and regulators for the doubly reflected Levy process is established. As applications, we derive the analytic pricing formula for a zero-coupon defaultable bond when the default intensity （resp. the stochastic loss rate） is modeled as one-sided （resp. double-sided） reflected Levy processes. Finally, some numerical illustrations are provided.展开更多
The perception of pain involves the activation of the spinal pathway as well as the supra-spinal pathway,which targets brain regions involved in affective and cognitive processes.Pain and emotions have the capacity to...The perception of pain involves the activation of the spinal pathway as well as the supra-spinal pathway,which targets brain regions involved in affective and cognitive processes.Pain and emotions have the capacity to influence each other reciprocally;negative emotions,such as depression and anxiety,increase the risk for chronic pain,which may lead to anxiety and depression.The amygdala is a key-player in the expression of emotions,receives direct nociceptive information from the parabrachial nucleus,and is densely innervated by noradrenergic brain centers.In recent years,the amygdala has attracted increasing interest for its role in pain perception and modulation.In this review,we will give a short overview of structures involved in the pain pathway,zoom in to afferent and efferent connections to and from the amygdala,with emphasis on the direct parabrachio-amygdaloid pathway and discuss the evidence for amygdala’s role in pain processing and modulation.In addition to the involvement of the amygdala in negative emotions during the perception of pain,this brain structure is also a target site for many neuromodulators to regulate the perception of pain.We will end this article with a short review on the effects of noradrenaline and its role in hypoalgesia and analgesia.展开更多
基金The National Natural Science Foundation of China(No.70671024).
文摘To investigate the process of information technology （IT） impacts on firm competitiveness, an integrated process model of IT impacts on firm competitiveness is brought forward based on the process-oriented view, the resource-based view and the complementary resource view, which is comprised of an IT conversion process, an information system （IS） adoption process, an IS use process and a competition process. The application capability of IT plays the critical role, which determines the efficiency and effectiveness of the aforementioned four processes. The process model of IT impacts on firm competitiveness can also be used to explain why, under what situations and how IT can generate positive organizational outcomes, as well as theoretical bases for further empirical study.
基金supported by Changwon National University in 2009-2010
文摘Remote monitoring of tools for prediction of tool wear in cutting processes was considered, and a method of implementation of a remote-monitoring system previously developed was proposed. Sensor signals were received and tool wear was predicted in the local system using an ART2 algorithm, while the monitoring result was transferred to the remote system via intemet. The monitoring system was installed at an on-site machine tool for monitoring three kinds of tools cutting titanium alloys, and the tool wear was evaluated on the basis of vigilances, similarities between vibration signals received and the normal patterns previously trained. A number of experiments were carried out to evaluate the performance of the proposed system, and the results show that the wears of finishing-cut tools are successfully detected when the moving average vigilance becomes lower than the critical vigilance, thus the appropriate tool replacement time is notified before the breakage.
基金Supported by the National Natural Science Foundation of China （50375026,50375028）
文摘Based on advantages of technology of distributive fiber-optic temperature sensing and specific to its applications in monitoring mine conflagration, the corresponding Processes such as connection arrangement, signal transmission and monitoring were illustrated. As applied in Sitai Coal Mine of Datong Coal Mine Group Co., this method is effective and accurate and could provide reliable gist for monitoring spontaneous combustion in gob area of mines.
基金Supported by the National Natural Science Foundation of China （21006127） and the National Basic Research Program of China （2012CB720500）.
文摘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 error.Then 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.
文摘Since the development of the market economy in our country, the information technology has a very far-reaching impact on development, in the process of social and economic operation,, different departments made its original operating mechanism changed according to their characteristics. However, for the tourism industry, the rapid development of the tourism industry has made the structure of the tourism industry restructure, the wide application of tourism e-commerce is one of the most typical performance. Tourism industry has the characteristics of the application of electronic commerce. Such as remote service, multi volume, low transaction amount and so on, the application of information technology in the tourism industry has led to the rapid development of tourism e-commerce, at the same time, it had changed the competition structure among the tourism enterprise. Seen from the current situation of e-conmaerce in China, there are still a lot of deficiencies and shortcomings in the international tourism industry. Based on the goal of China＇ s tourism development, carry out the development of tourism e-commerce is the first priority of the tourism industry.
基金supported by National Natural Science Foundation of China(GrantNos.11001213,71201074 and 70932003)NCET-12-0914the Fundamental Research Funds for the Central Universities(Grant No.K5051370001)
文摘We study the smooth-pasting property for a class of conditional expectations with reflected Levy process as underlying state process. A relationship between local times and regulators for the doubly reflected Levy process is established. As applications, we derive the analytic pricing formula for a zero-coupon defaultable bond when the default intensity （resp. the stochastic loss rate） is modeled as one-sided （resp. double-sided） reflected Levy processes. Finally, some numerical illustrations are provided.
文摘The perception of pain involves the activation of the spinal pathway as well as the supra-spinal pathway,which targets brain regions involved in affective and cognitive processes.Pain and emotions have the capacity to influence each other reciprocally;negative emotions,such as depression and anxiety,increase the risk for chronic pain,which may lead to anxiety and depression.The amygdala is a key-player in the expression of emotions,receives direct nociceptive information from the parabrachial nucleus,and is densely innervated by noradrenergic brain centers.In recent years,the amygdala has attracted increasing interest for its role in pain perception and modulation.In this review,we will give a short overview of structures involved in the pain pathway,zoom in to afferent and efferent connections to and from the amygdala,with emphasis on the direct parabrachio-amygdaloid pathway and discuss the evidence for amygdala’s role in pain processing and modulation.In addition to the involvement of the amygdala in negative emotions during the perception of pain,this brain structure is also a target site for many neuromodulators to regulate the perception of pain.We will end this article with a short review on the effects of noradrenaline and its role in hypoalgesia and analgesia.
