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The digital trunking system has the characteristics that the calling mode is mainly group calling and the communication mode is mostly half duplex. For the problem that the traditional user classification method couldn't meet the classification requirements of digital cluster users, this paper proposed a digital cluster user classification method based on improved RFM model. Firstly, it introduced the average speech duration attribute to establish the recency vitality speak (RVS) model. Then, it used the analytic hierarchy process to determine the weight of each parameter in the model. Finally, it used the K-means + + clustering algorithm to classify digital cluster users. The simulation result shows that, by using the user classification method proposed in this paper, the accuracy of digital cluster user classification can reach more than 87. 9% . [ABSTRACT FROM AUTHOR]

Objective　To investigate the effect of tetrahydrobiopterin (BH4), superoxide dismutase-polyethylene glycol (PEG-SOD) and N(G)-nitro-L-arginine (L-NNA) on impaired endothelial progenitor cell (EPC) functions in DOCA-salt hypertensive mice. Methods　DOCA-salt hypertension was created and systolic blood pressure was measured by tail-cuff methods. EPC was isolated from bone marrow of mice and characterized by flow cytometry and fluorescence microscopy. EPC of DOCA-salt mice was incubated with BH4, PEG-SOD, and L-NNA for 24 h, then in vitro EPC function assays were performed. Results　Compared with control group, systolic blood pressure was significantly increased in DOCA-salt mice. Both EPC adhesion and angiogenesis functions were impaired in DOCA-salt mice compared to control animals, which were reversed by incubation with BH4, PEG-SOD and L-NNA. Conclusion　BH4, PEG-SOD and L-NNA rescued the impairments from EPC functions in DOCA-salt hypertensive mice. [ABSTRACT FROM AUTHOR]

Objective: To explore suitable family education measures for community-based schizophrenia patients in China for improving patients' symptoms and detecting deterioration of symptoms in time, and evaluate the intervention's effects. Methods: This study was conducted in 4 cities in eastern, central and western China. A total of 298 families of patients from 42 communities were recruited based on the inclusion criteria. Totally 150 families and 148 families were enrolled in the intervention group and the control group randomly. The intervention group received a family education based on social cognitive theory, namely "safe shelter", and the control group got a routine management program in the community for 12 months. With the support of the "safe shelter", the families of patients in the intervention group assessed the early signs of relapse (worsening) at least once a month, and took corresponding measures according to the score. At baseline and at the end of the 12th month, using the Clinical Global Impression (CGI) scale, the community mental health workers evaluated severity of illness (SI), global improvement (GI) and efficacy Index (EI). The primary outcome was the difference of two groups' CGI-SI score changes between the end of the 12th month and baseline. Results: Before and after the intervention, the CGI-SI scores in the intervention group[ 2.8 plus/minus 0.7 ) vs. (2.1 plus/minus 1) ] and the control group [ (2.8 plus/minus 1.1) vs. (2.5 plus/minus 1.2) * 1 were both significantly reduced (P_{s} < 0.05), and the changes were significantly 0.3 larger in the intervention group than in the control group (P < 0.001) . The CGI-GI scores were significant decreased in both of the intervention group and the control group (P_{s} < 0.05) . Compared with the baseline, the CGI-EI scores were significantly in- creased at the end of the 12th month in the intervention group (P < 0.05), while no statistical difference was found in the control group (P > 0.05) . Conclusion: The family education could effectively improve the disease symptoms, consolidate the therapeutic effect, avoid relapse and maintain the state of recovery. [ABSTRACT FROM AUTHOR]

Objective To explore the influencing factors of adolescent runaway and its correlation with family health so as to provide epidemiological evidence for future comprehensive interventions. Methods Using the quota sampling method, 1 065 adolescents aged 12-18 years old were surveyed by Questionnaire Star in 120 cities in China from July to September 2021. A well-developed electronic questionnaire was used to collect information about demographic characteristics, psychological characteristics, family health, social support, and behavior of running away from home. Univariate analysis and Logistic regression were used to explore the influencing factors of adolescent runaway and its correlation with family health. Results A total of 1 065 adolescents were investigated, among whom 334 were the only children (31.36%). and 442 were boys (41.50%). Univariate analysis revealed that 7.6% of teenagers had the experience of running away from home in the last 30 days. Participants who were ethnic minorities (P=0.031). and had education of technical school or junior college (P=0.029). and a low family income (P＜0.001). were more likely to have running away behavior. Adolescents with low self-efficacy (P=0.005), depression (P＜0.001), anxiety (P＜0.001), and more stress had higher detection rates of runaway behavior. However, adolescents with higher family health and social support were less likely to run away from home (P＜0.01). Multivariate analysis showed that compared with adolescents with low family health, adolescents with high (OR=0.16, 95% CI: 0.06-0.46). and moderate (OR =0.27, 95% CI: 0.14-0.55). family health had a significantly lower risk of runaway behavior. Conclusion The family is of great significance in preventing teenagers from running away from home. Parents should build a good parent-child relationship and create a happy family atmosphere to reduce the occurrence of teenagers running away from home. [ABSTRACT FROM AUTHOR]

Objective:To examine the validity and reliability of the Work-Family Conflict Scale（WAFCS） among working parents in China.Methods:The formal investigation was attached to the "2021 China Family Health Index Survey".A total of 477 valid questionnaires were screened out.The validity of the questionnaire was tested by content validity index and confirmatory factor analysis.The Cronbach a coefficient and retest correlation coefficient were used to test the reliability of the questionnaire.Results:The WAFCS contained 2 dimensions,namely WorkFamily Conflict（WFC） and Family-Work Conflict（FWC）,with 5 items in each dimension.Item analysis showed that each item of the Chinese version of WAFCS had good differentiation and homogeneity.The content validity index and average content validity index of each item assessed by experts were greater than 0.88,and the content validity of the scale was good.Validation factor analysis showed that χ~2/df=2.95,GFI=0.97,NFI=0.98,RFI=0.97,and RMSEA=0.06.The Cronbach a coefficients of the scale overall and the two dimensions of WFC and FWC were 0.93,0.90 and 0.92,respectively.Conclusion:The Chinese version of the Work-Family Conflict Scale（WAFCS） has good construct validity and reliability in evaluating the working parents in China. [ABSTRACT FROM AUTHOR]

TBM 施工隧道中围岩塌方将引发 TBM 掘进受阻、卡机等问题，严重影响了隧道施工安全和掘进效率。 通过国内外典型 TBM 施工隧道围岩塌方案例，总结了 TBM 塌方段地质特点，分析了围岩塌方原因，认为围岩性质较差、围岩结构面发育、高地应力 影响、地下水影响和其他原因是 TBM 施工隧道围岩塌方的主要原因；根据塌方位置和塌方原因探讨了围岩塌方类型划分，最后对 TBM 围岩塌方处理技术和围岩塌方预防技术进行了综述。 [ABSTRACT FROM AUTHOR]

Objective: To analyze the relation of depressive symptoms to personality traits and exercise behavior in patients with type 2 diabetes. Methods: Totally 718 patients with type 2 diabetes were included in this study. They were assessed with the Patient Health Questionnaire-8(PHQ-8) and Chinese Big Five Personality Inventory Brief version (CBF-PI-B) . Logistic model was established to analyze the associations between depressive symptoms and different personality traits among patients with type 2 diabetes, and further estimated the moderating effect of exercise behavior. Results: Totally 161 patients had depressive symptoms ( 22. 4%). Neuroticism and agreeableness (OR = 1. 08, 1. 08) were associated with having depressive symptoms. People who had exercise, being male, with longer duration of diagnosis were more likely to have no depressive symptoms ( OR = 0. M, 0. 47, 0. 62), whereas people who had taken medication/insulin were more likely to have depressive symptoms ( OR = 2. 23). Exercise could reduce the association between neuroticism and depression ( OR = 0. 95), but had no effect on the relationship between agreeableness and depression ( P > 0. 05). Conclusion: Neuroticism and agreeableness are associated with depression in patients with type 2 diabetes. Exercise has a significant moderating effect on the association between neuroticism trait and depression. [ABSTRACT FROM AUTHOR]

Objective:To explore the relation of depression to quality of life and family support in patients with type 2 diabetes.Methods:Totally 775 patients with type 2 diabetes mellitus from 4 community health care centers of Beijing were collected.They were assessed with the eight-item Patient Health Questionnaire depression scale(PHQ-8), Diabetes Specific Quality of Life Scale(DSQL),self-compiled Diabetes Family Support Questionnaire and self-compiled Diabetes Self-Efficacy Questionnaire.A binary logistic regression model was used to analyze the related factors of depression in patients with type 2 diabetes.Results:The positive rate of depression symptom screening was 16.8%(130/775).In the binary logistic regression model,females(OR=1.85),patients under 50 years old(OR=2.57) and with a disease course within 5 years(OR=2.91) were more likely to have depression symptoms.Patients with better quality of life(DSQL score,OR=0.10) and family criticism support better supplydemand matching(OR=0.62) were less likely to have depression symptoms.Conclusion:Female,younger age,shorter disease course,poorer quality of life and family criticism support with poorer supply-demand matching may be risk factors of depression symptoms in patients with type 2 diabetes in community. [ABSTRACT FROM AUTHOR]