Considering the effects of particle crushing and intermediate principal stress on material yielding strength, the spatial mobilization plane(SMP) yielding criterion and state parameter model including a general critic...Considering the effects of particle crushing and intermediate principal stress on material yielding strength, the spatial mobilization plane(SMP) yielding criterion and state parameter model including a general critical state line are selected in the analysis of cylindrical cavity expansion.Meanwhile, combining Rowe s flow rule and Bolton s simplification to stress-dilatancy relationship to reflect soil shear dilatancy and softening behavior, this paper analyzes the problem of cylindrical cavity expansion i...展开更多
We aimed to study the appropriate posture of peripherally inserted central catheter （PICC） patients, to reduce the incidence of internal jugular vein heterotopia. Methods： From 2009 to 2013, a total of 290 cases wi...We aimed to study the appropriate posture of peripherally inserted central catheter （PICC） patients, to reduce the incidence of internal jugular vein heterotopia. Methods： From 2009 to 2013, a total of 290 cases with PICC were enrolled in our study. They were divided into two groups. The patients in control group took regular position, which mean pros- tration, upper limb of tube side was abduction 90°, head moved to puncture side in order to block the internal jugular vein. On the basis of conventional body position putting, posture of patients in observation group was improved, the head remain neutral, and had 180° angle with trunk longitudinal axis, not favor any side. After ensuring the upper limb abduction, had 90° angle with the trunk, then catheter was inserted slowly. The jugular venous catheter heterotopia rate was judged by X.ray results. Results： The jugular venous catheter heterotopia rate of control group and observation was 12.8% and 0.68%, respectively. The difference between two groups was statistically significant （P 〈 0.01）. Conclusion： The body posture improvement can prevent discomfort of patients and reduce the jugular venous catheter heterotopia rate of PICC.展开更多
Accuracy and fastness of iris localization are very important in automatic iris recognition. A new fast iris localization algorithm based on improved generalized symmetry transform (GST) was proposed by utilizing (iri...Accuracy and fastness of iris localization are very important in automatic iris recognition. A new fast iris localization algorithm based on improved generalized symmetry transform (GST) was proposed by utilizing (iris) symmetry. GST was improved in three aspects:1) A new distance weight function is defined. The new weight function, which is effective in iris localization, utilized the characteristic of irises that the iris is a circular object and it has one inner boundary and one outer boundary. 2) Each calculation of the symmetry measurement of a pair of symmetry points was performed by taking one point of a pair as the starting point of the transformation. This is the most important reason for fast iris localization,due to which, repetitious computation was largely excluded. 3) A new phase weight function was proposed to adjust GST to locate circle target much better because the inner part of iris is darker than the outer part. The edge map of iris image was acquired and GST was only implemented on the edge point, which decreased computation without loss of accuracy. The modification of distance weight function and phase weight function leads to the accuracy of localization, and other ideas speed up the localization. Experiments show that the average speed of new algorithm is about 7.0—8.5 times as high as traditional ones including integro-differential operator and Hough transform method.展开更多
Objective:The Consolidated Standards for Reporting of Trials(CONSORT) statement has already proved to be an efficient standard for reporting quality of randomized controlled trials(RCTs).However,most of the Chinese me...Objective:The Consolidated Standards for Reporting of Trials(CONSORT) statement has already proved to be an efficient standard for reporting quality of randomized controlled trials(RCTs).However,most of the Chinese medical journals have not endorsed the CONSORT statement.The current situation about the reporting quality of RCTs in Chinese medical journals is still unclear.The purpose of the study was to evaluate the reporting quality of RCTs on papers published in 5 leading Chinese medical journals.Methods:We evaluated 232 original RCT papers using a reporting quality scale based on CONSORT statement from 2001 to 2006 in 5 Chinese medical journals(Journal type 1) without adoption of CONSORT and Chinese Journal of Evidence-based Medicine(Journal type 2) which adopted CONSORT in 2004.We measured the inclusion of 26 items for the reporting quality scale and 6 core items of each RCT report,gave score to each item and calculated the total score obtained in each report and the proportion of reports including individual items.The reporting quality of RCT trials from 2001 to 2003(pre-adoption period) was compared with that from 2004 to 2006(post-adoption period).Results:The average reporting quality of RCTs was moderate(mean score,15.18),and the mean score of the 6 core items was low(mean score,1.09) in 5 leading journals.The difference in the total score and the score of the 6 core items between pre-adoption period(2001-2003) and post-adoption period(2004-2006) was statistically significant(P=0.003;P=0.000).Interaction between journal type and period was not significant(F=0.76;P=0.383).We concluded that the change tendency of reporting quality between Journal type 1 and 2 was not different.But as to the core items of sequence concealment and intention-to-treat analysis,the increases were greater for Journal type 2 when evaluated against Journal type 1(P=0.038;P=0.016).Conclusion:The reporting quality of RCT trials in 5 leading Chinese medical journals is improving.However,the lack of important items in RCT trials remains a serious problem.We recommend the endorsement of the Consolidated Standards for Reporting of Trials statement in Chinese medical journals and the continuing education on evidence-based medicine in China.展开更多
基金Supported by National Natural Science Foundation of China (No. 50639010)PhD Start-up Research Fund of Northeast Dianli University (2010)
文摘Considering the effects of particle crushing and intermediate principal stress on material yielding strength, the spatial mobilization plane(SMP) yielding criterion and state parameter model including a general critical state line are selected in the analysis of cylindrical cavity expansion.Meanwhile, combining Rowe s flow rule and Bolton s simplification to stress-dilatancy relationship to reflect soil shear dilatancy and softening behavior, this paper analyzes the problem of cylindrical cavity expansion i...
文摘We aimed to study the appropriate posture of peripherally inserted central catheter （PICC） patients, to reduce the incidence of internal jugular vein heterotopia. Methods： From 2009 to 2013, a total of 290 cases with PICC were enrolled in our study. They were divided into two groups. The patients in control group took regular position, which mean pros- tration, upper limb of tube side was abduction 90°, head moved to puncture side in order to block the internal jugular vein. On the basis of conventional body position putting, posture of patients in observation group was improved, the head remain neutral, and had 180° angle with trunk longitudinal axis, not favor any side. After ensuring the upper limb abduction, had 90° angle with the trunk, then catheter was inserted slowly. The jugular venous catheter heterotopia rate was judged by X.ray results. Results： The jugular venous catheter heterotopia rate of control group and observation was 12.8% and 0.68%, respectively. The difference between two groups was statistically significant （P 〈 0.01）. Conclusion： The body posture improvement can prevent discomfort of patients and reduce the jugular venous catheter heterotopia rate of PICC.
文摘Accuracy and fastness of iris localization are very important in automatic iris recognition. A new fast iris localization algorithm based on improved generalized symmetry transform (GST) was proposed by utilizing (iris) symmetry. GST was improved in three aspects:1) A new distance weight function is defined. The new weight function, which is effective in iris localization, utilized the characteristic of irises that the iris is a circular object and it has one inner boundary and one outer boundary. 2) Each calculation of the symmetry measurement of a pair of symmetry points was performed by taking one point of a pair as the starting point of the transformation. This is the most important reason for fast iris localization,due to which, repetitious computation was largely excluded. 3) A new phase weight function was proposed to adjust GST to locate circle target much better because the inner part of iris is darker than the outer part. The edge map of iris image was acquired and GST was only implemented on the edge point, which decreased computation without loss of accuracy. The modification of distance weight function and phase weight function leads to the accuracy of localization, and other ideas speed up the localization. Experiments show that the average speed of new algorithm is about 7.0—8.5 times as high as traditional ones including integro-differential operator and Hough transform method.
文摘Objective:The Consolidated Standards for Reporting of Trials(CONSORT) statement has already proved to be an efficient standard for reporting quality of randomized controlled trials(RCTs).However,most of the Chinese medical journals have not endorsed the CONSORT statement.The current situation about the reporting quality of RCTs in Chinese medical journals is still unclear.The purpose of the study was to evaluate the reporting quality of RCTs on papers published in 5 leading Chinese medical journals.Methods:We evaluated 232 original RCT papers using a reporting quality scale based on CONSORT statement from 2001 to 2006 in 5 Chinese medical journals(Journal type 1) without adoption of CONSORT and Chinese Journal of Evidence-based Medicine(Journal type 2) which adopted CONSORT in 2004.We measured the inclusion of 26 items for the reporting quality scale and 6 core items of each RCT report,gave score to each item and calculated the total score obtained in each report and the proportion of reports including individual items.The reporting quality of RCT trials from 2001 to 2003(pre-adoption period) was compared with that from 2004 to 2006(post-adoption period).Results:The average reporting quality of RCTs was moderate(mean score,15.18),and the mean score of the 6 core items was low(mean score,1.09) in 5 leading journals.The difference in the total score and the score of the 6 core items between pre-adoption period(2001-2003) and post-adoption period(2004-2006) was statistically significant(P=0.003;P=0.000).Interaction between journal type and period was not significant(F=0.76;P=0.383).We concluded that the change tendency of reporting quality between Journal type 1 and 2 was not different.But as to the core items of sequence concealment and intention-to-treat analysis,the increases were greater for Journal type 2 when evaluated against Journal type 1(P=0.038;P=0.016).Conclusion:The reporting quality of RCT trials in 5 leading Chinese medical journals is improving.However,the lack of important items in RCT trials remains a serious problem.We recommend the endorsement of the Consolidated Standards for Reporting of Trials statement in Chinese medical journals and the continuing education on evidence-based medicine in China.
