Feature extraction is a very crucial step in P300-based brain-computer interface (BCI) and independent component analysis (ICA) is a suitable P300 feature extraction method. But at present the convergence performance of the general ICA iteration methods are not very satisfactory. In this paper, a method based on quantum particle swarm optimizer (QPSO) algorithm and ICA technique is put forward for P300 extraction. In this method, quantum computing is used to impel ICA iteration to globally converge faster. It achieved the purpose of extracting P300 rapidly and efficiently. The method was tested on two public datasets of BCI Competition Ⅱ and Ⅲ, and a simple linear classifier was employed to classify the extracted P300 features. The recognition accuracy reached 94.4% with 15 times averaged. The results showed that the proposed method could extract P300 rapidly and the extraction effect did not reduce. It provides an experimental basis for further study of real-time BCI system.
Objective To systematically review literature on the influencing factors related to adolescent sub-health problems. Methods We electronically searched the following four databases including CBM, VIP, CNKI and WanFang Data to collect Chinese literature on adolescent sub-health status and problems in China published before May 2012. Two reviewers independently screened literature, extracted data, and cross checked records. Then qualitative analysis was applied. Results According to the inclusion and exclusion criteria, 41 cross-sectional studies were included. The results of qualitative analysis showed that the influencing factors of adolescent sub-health could be classified into four categories including social factors, family factors, school factors, and interpersonal relationships. The main ones were social support, employment pressure, family economic conditions, learning burden, unhealthy habits, etc. Conclusions There are many influencing factors of adolescent sub-health with interaction. Due to the limitation of the included studies, more prospective cohort studies are needed to provide high quality evidence.
ObjectiveTo study the diagnostic significance of modified Alvarado Score System for different types of acute appendicitis. MethodsClinical data of 1 930 cases of acute appendicitis, who underwent appendicectomy in The First Hospital of Yulin from Jan. 2004 to Jan. 2014, were retrospectively collected. Then the diagnostic significance of Modified Alvarado Score System was detected and evaluated by receiver operating characteristic (ROC) curve, and its correlation with postoperative pathological results was calculated. ResultsThe modified Alvarado score of cases in progressive group was higher than that of simplex group (7.5±1.3 vs. 3.6±0.7, P < 0.001). The areas under ROC curve of modified Alvarado Score System was 0.943 (95% CI:0.929-0.958, P < 0.001). The critically diagnostic points of Modified Alvarado Score System for differential diagnosis of simplex acute appendicitis and progressive acute appendicitis was 6 score, with sensitivity of 92.9%, specificity of 86.3%, positive predictive value of 96.9%, negative predictive value of 72.6%, positive likelihood ratio of 6.8, negative likelihood ratio of 0.1, and Youden index of 91.7%. ConclusionThis Modified Alvarado Score System has a certain significance for the type diagnosis of acute appendicitis.
ObjectiveTo analyze research status of influencing factors related to sun-protection problems in children and adolescents, and systematically review the influencing factors. MethodsWe electronically searched the following databases including The Cochrane Library, PubMed, Web of Knowledge, Ovid, EBSCO, EMbase, CBM, CNKI, VIP and WanFang Data to collect cross-sectional studies on sun-protection problems in children and adolescents up to December 2012. The criteria for cross-sectional studies recommended by AHQR was applied in the assessment of included studies. Then, qualitative analysis methods were used to systematically summarize information and results of the included studies. ResultsA total of 10 studies were included. The results showed that, the influencing factors of sun-protection behaviour in children and adolescents included gender, age, skin colour, eye colour, the mass media information, school health education, etc., of which, researches on gender, grade, light skin, eye colour were relatively more. ConclusionAt present, there are many studies about influencing factors related to sun-protection problems in children and adolescents while the target influencing factors differ in regions.
Objective To explore the application of peer education in TB prevention at middle schools in Kai County of Chongqing and compare it with traditional education, and to provide theory support for further policy making. Methods Four complete middle schools were randomly selected as the control group, the peer education group, the traditional education group and the combined group of peer education and traditional education, respectively. Effect evaluation was performed one month later (instant evaluation) and six months later (long-term evaluation), respectively, after the intervention period. Results The instant and long-term evaluation showed that the knowledge, attitude and practice scores of the three intervention groups were higher than the scores before intervention or those of the control group (Plt;0.01). Besides, the behavior score of the peer education group had no significant difference between instant and longterm evaluation. All scores in the instant evaluation were higher than those of long-term evaluation both in the peer education group and the traditional education group (Plt;0.01). For the knowledge, attitude and practice scores, there was no significant difference between instant and long-term evaluation in the combined group of peer education and traditional education. Conclusion Compared with the peer education group and the traditional education group, the combined group achieves an enduring effect. There is obvious instant effect in the traditional education group, and peer education has a long-term influence on students’ behavior.
Objective To evaluate the effect of maternal and child health care training at the primary levelin Chongqing, and to detect and solve the existing problems so as to provide evidence for the further training andmonitoring. Methods The rural maternal and children health staff of Rongchang County, Chongqing were trained. A test and, in-depth interviews and field observation wereused to evaluate the training process and results. Results Seventynine members of the Clinical Skill Group (CS) and 73 members of Health Education Group (HE) have taken the test. The median score of CS before training was 11 while it was 23 after training (Plt;0.01); the median score of HE was 18 before training while it was 25 after training (Plt;0.01). The scores change of thetest before and after training showed that the training had a good result. Conclusion Primary level health staff members had poor knowledge of maternal and children health care. This training enhanced their knowledge of maternal and child health care improved their skill. Organizers should ensure that the training contents are rich,novel, and varied. Maternal and child health staff should be willing to join the training.