目的新兴视频服务的功能参数设置将会直接影响到用户的认知状态,进一步影响用户体验质量,称为功能性用户体验质量(functional quality of experience,fQoE)。脑电信号蕴含丰富的大脑活动信息,能够揭示复杂脑活动中的脑网络模式,为fQoE...目的新兴视频服务的功能参数设置将会直接影响到用户的认知状态,进一步影响用户体验质量,称为功能性用户体验质量(functional quality of experience,fQoE)。脑电信号蕴含丰富的大脑活动信息,能够揭示复杂脑活动中的脑网络模式,为fQoE提供可靠的评估依据。为此,本文首次提出了一个基于脑电的脑网络构建方法以评估fQoE,并研究fQoE背后的神经机制。方法首先,通过改变功能参数诱发不同水平的fQoE,并同步收集脑电数据;然后,从脑电数据中提取单电极和多电极特征并以图结构进行融合,用以全面表征用户使用视频服务时的大脑状态;最后,使用基于自注意力图池化的脑网络构建模型来识别对fQoE敏感的脑网络,为fQoE提供可解释性,并进行分类以完成fQoE评估。结果本文以弹幕视频服务的弹幕覆盖率这一功能参数为例验证了方法的科学性和可行性。实验表明,提出的评估方法在多种视频类型的fQoE评估中均达到了满意的效果,最佳识别准确率分别为86%(鬼畜类)、81%(科技类)、80%(舞蹈类)、82%(影视类)和84%(音乐类)。结论来自fQoE相关的脑网络分析结果表明,额极、额中回、顶叶和颞叶的脑连接数量减少预示着观看弹幕视频的fQoE更高,即观看体验更好,同时也证明了功能参数通过影响人的脑状态进一步导致了fQoE的改变。本文的评估方法为fQoE的精确评估和视频服务功能参数的优化提供了来自神经生理学的定量工具和理论依据。展开更多
Functionalized graphene nano-sheets(FGN) of 0.01%-0.05%(mass fraction) were added to produce FGN-cement composites in the form of mortars. Flow properties, mechanical properties and microstructure of the cementitious ...Functionalized graphene nano-sheets(FGN) of 0.01%-0.05%(mass fraction) were added to produce FGN-cement composites in the form of mortars. Flow properties, mechanical properties and microstructure of the cementitious material were then investigated. The results indicate that the addition of FGN decreases the fluidity slightly and improves mechanical properties of cement-based composites significantly. The highest strength is obtained with FGN content of 0.02% where the flexural strength and compressive strength at 28 days are 12.917 MPa and 52.42 MPa, respectively. Besides, scanning electron micrographs show that FGN can regulate formation of massive compact cross-linking structures and thermo gravimetric analysis indicates that FGN can accelerate the hydration reaction to increase the function of the composite effectively.展开更多
AIM to evaluate gender differences in the aspect of ghrelin,nociception-related genes and psychological aspects and the quality of life(Qo L) in Korean functional dyspepsia(FD) patients.METHODS Total of 191 persons we...AIM to evaluate gender differences in the aspect of ghrelin,nociception-related genes and psychological aspects and the quality of life(Qo L) in Korean functional dyspepsia(FD) patients.METHODS Total of 191 persons were prospectively enrolled between March 2013 and May 2016 in Seoul National Bundang Hospital,and classified into control and FD group based on ROME Ⅲ criteria. Questionnaire included assessment for dyspepsia symptoms,Qo L and anxiety or depression. Preproghrelin and nociception genes in the gastric mucosa and plasma acyl/des-acyl ghrelin were measured. RESULTS Lower level of plasma acyl ghrelin in FD patients compared to control was significant only in male(15.9 fmol/m L vs 10.4 fmol/m L,P = 0.017). Significantly higher m RNA expressions of nerve growth factor and transient receptor potential vanilloid receptor 1 were observed in male(P = 0.002 and P = 0.014,respectively) than in female. In contrast,female FD patients had a higher anxiety and depression score than male FD(P = 0.029),and anxiety score was correlated with epigastric pain only in female FD patients(female: Spearman rho = 0.420,P = 0.037). The impairment of overall Qo L was more prominent in female FD patients than male patients(5.4 ± 0.3 vs 6.5 ± 0.3,P = 0.020). CONCLUSION Gender differences of ghrelin and nociception-related genes in male and psychological factors in female underlie FD symptoms. More careful assessment of psychological or emotional status is required particularly for the female FD patients.展开更多
Objective： Preservation of the pelvic autonomic nerves in order to lower bladder and sexual dysfunction after radical rectal cancer surgery ＆ to evaluate functional outcome, local recurrence. Methods： A prospective...Objective： Preservation of the pelvic autonomic nerves in order to lower bladder and sexual dysfunction after radical rectal cancer surgery ＆ to evaluate functional outcome, local recurrence. Methods： A prospective study was under- taken on Egyptian patients. Forty one patients participated in the study in the period from December 2002 till June 2004 where they underwent radical surgery but with preservation of the pelvic autonomic nerves this was followed by adjuvant pelvic radiotherapy. Results： Six months, 1-year and 2-year follow-up of urinary function was complete in 32 out of 41 （78%）, 30 out of 41 （73%） and 27 out of 41 patients （65%） respectively There was no statistically significant correlation between the extent of nerve preservation and the reported minor voiding dysfunction. None of the patients reported major incontinence. Six months, 1-year and 2-year follow-up of sexual function revealed that 22 out of 41 patients （53%） were sexually active. Three out of 41 patients （7.3%） developed local recurrence. 38 （92.7%） patients were free of local recurrence, regarding pa- tients who received adjuvant radiotherapy 3 out of the 34 （8.8%） patients developed local pelvic recurrence while 9 patients （26.5%） developed distant metastases （3 of them did not receive adjuvant chemotherapy）, while patients who received adju- vant chemotherapy, 2 out of 20 patients （10%） developed local recurrence while distant metastases developed in 6 patients （30%）. Conclusion： Preservation of the pelvic autonomic nerves minimizes bladder and sexual dysfunction especially in male patients after rectal cancer surgery.展开更多
Methods Two Qihai （气海 CV Objective To discuss the efficacy of acupuncture for groups of points were applied alternatively to 90 cases by chronic functional constipation acupuncture： （1） Tianshhu （CFC）. ST 25）...Methods Two Qihai （气海 CV Objective To discuss the efficacy of acupuncture for groups of points were applied alternatively to 90 cases by chronic functional constipation acupuncture： （1） Tianshhu （CFC）. ST 25）, 6）, Shemgjfuxu （上巨虚 ST 37）, etc. （2）Zhongliao （中髎 BL 33）, Xiadiao （下髎 BL 34）, Dachangshu （大肠俞 BL 25）, etc. Electroacupuncture was applied in combination at Zhongliao （中髎 BL 33）, Xialiao （下髎 BL 34）, Tianshu（天枢 ST 25） and Shamgjuxu （上巨虚 ST 37）, once a day, 10 treatments made one session. By constipation diary of patients, frequency of going to stool, straining severity, time of once bowl evacuation, a sense of incomplete bowel emptying, stool quality, a sense of defecation and the Patient Assessment of Constipation Quality of Life questionnaire （PAC-QOL）, as well as the changes before and after treatment were observed. Results After treatment, the apparent improvements were achieved in frequency of going to stool, straining severity, time of once bowl evacuation, a sense of incomplete bowel emptying, a sense of defecation and score of PAC-QOL as compared with those before treatment （all P〈0.01）. The total effective rate was 67.7% （61/70）. The acupuncture effieacies were various on CFC of different dynamic mechanisms. The efficacy on slow transit constipation （STC） was superior to that caused by spastic pelvic floor syndrome （SPFS-C） （P〈0.05）, the efficacy on constipation caused by irritable bowel syndrome （IBS-C） was superior to that on either SPFS-C or constipation caused by relaxant pelvic floor syndrome （RPFS-C） （both P〈0.05）. Of 52 eases in effective follow-up, 1 month after treatment, 3 eases were cured, 6 eases markedly effective, 23 eases effective, and 20 cases failed; 3 months after treatment, 3 eases were cured, 5 eases markedly effective, 16 cases effective and 28 cases failed. Conclusion Acupuncture has definite efficacy on CFC with definite etiology, loci and diagnostic classification. But, the efficacies are different due to various dynamic mechanisms. A further optimized treatment program is required to improve the efficacy on SPFS-C and RPFS-C.展开更多
OBJECTIVE:To examine the clinical effects of a mixture of Chinese Yam and Epimedium in patients with stable moderate or severe chronic obstructive pulmonary disease(COPD).METHODS:Forty-nine patients with COPD were ran...OBJECTIVE:To examine the clinical effects of a mixture of Chinese Yam and Epimedium in patients with stable moderate or severe chronic obstructive pulmonary disease(COPD).METHODS:Forty-nine patients with COPD were randomly allocated to a group whose usual treatment was supplemented with oral Chinese Yam-Epimedium mixture,or a control group given placebo.For each patient,body mass index,airflow obstruction,dyspnea,and exercise capacity were measured and converted into the BODE index before treatment and at one and three months after initiation of treatment.Participants also completed the St George's Respiratory Questionnaire(SGRQ) at the same intervals.RESULTS:After one month,improvements were seen in the BODE index and SGRQ of participants taking Chinese Yam-Epimedium mixture compared to controls.There were statistically significant differences in the SGRQ:three of its components and the total SGRQ scores were significantly decreased(P<0.05),respiratory symptom scores had improved(P<0.01),and the dyspnea component of the BODE index had significantly decreased(P<0.05).Similar improvements were observed after three months of treatment,but exercise tolerance had also improved:the six-minute walking distance had significantly increased(P<0.05) in the treatment group when compared with controls.CONCLUSION:Chinese Yam-Epimedium mixture can significantly improve dyspnea,exercise capacity,and the quality of life of patients with stable moderate or severe COPD.展开更多
Plant leaf litter decomposition provides a source of energy and nutrients in forest ecosystems.In addition to traditional environmental factors,the degradation process of litter is also affected by plant functional tr...Plant leaf litter decomposition provides a source of energy and nutrients in forest ecosystems.In addition to traditional environmental factors,the degradation process of litter is also affected by plant functional traits and litter quality.However,at the community level,it is still unclear whether the relative importance of plant traits and litter quality on the litter decomposition rate is consistent.A year-long mixed leaf litter decomposition experiment in a similar environment was implemented by using the litterbag method in seven typical forest types in Dongling Mountain,Beijing,North China,including six monodominant communities dominated by Juglans mandshurica,Populus cathayana,Betula dahurica,Betula platyphylla,Pinus tabuliformis and Larix gmelinii var.principis-rupprechtii and one codominant community dominated by Fraxinus rhynchophylla,Quercus mongolica and Tilia mongolica.The results showed that there were considerable differences in the litter decomposition rate(k-rate)among the different forest types.The community weighted mean(CWM)traits of green leaves and litter quality explained 35.60%and 9.05%of the k-rate variations,respectively,and the interpretation rate of their interaction was 23.37%,indicating that the CWM traits and their interaction with litter quality are the main factors affecting the k-rate variations.In the recommended daily allowance,leaf nitrogen content,leaf dry matter content,leaf tannin content and specific leaf area were the main factors affecting the k-rate variations.Therefore,we suggest that future studies should focus on the effects of the CWM traits of green leaves on litter decomposition at the community level.展开更多
文摘目的新兴视频服务的功能参数设置将会直接影响到用户的认知状态,进一步影响用户体验质量,称为功能性用户体验质量(functional quality of experience,fQoE)。脑电信号蕴含丰富的大脑活动信息,能够揭示复杂脑活动中的脑网络模式,为fQoE提供可靠的评估依据。为此,本文首次提出了一个基于脑电的脑网络构建方法以评估fQoE,并研究fQoE背后的神经机制。方法首先,通过改变功能参数诱发不同水平的fQoE,并同步收集脑电数据;然后,从脑电数据中提取单电极和多电极特征并以图结构进行融合,用以全面表征用户使用视频服务时的大脑状态;最后,使用基于自注意力图池化的脑网络构建模型来识别对fQoE敏感的脑网络,为fQoE提供可解释性,并进行分类以完成fQoE评估。结果本文以弹幕视频服务的弹幕覆盖率这一功能参数为例验证了方法的科学性和可行性。实验表明,提出的评估方法在多种视频类型的fQoE评估中均达到了满意的效果,最佳识别准确率分别为86%(鬼畜类)、81%(科技类)、80%(舞蹈类)、82%(影视类)和84%(音乐类)。结论来自fQoE相关的脑网络分析结果表明,额极、额中回、顶叶和颞叶的脑连接数量减少预示着观看弹幕视频的fQoE更高,即观看体验更好,同时也证明了功能参数通过影响人的脑状态进一步导致了fQoE的改变。本文的评估方法为fQoE的精确评估和视频服务功能参数的优化提供了来自神经生理学的定量工具和理论依据。
基金Project(51102035)supported by the National Natural Science Foundation of China
文摘Functionalized graphene nano-sheets(FGN) of 0.01%-0.05%(mass fraction) were added to produce FGN-cement composites in the form of mortars. Flow properties, mechanical properties and microstructure of the cementitious material were then investigated. The results indicate that the addition of FGN decreases the fluidity slightly and improves mechanical properties of cement-based composites significantly. The highest strength is obtained with FGN content of 0.02% where the flexural strength and compressive strength at 28 days are 12.917 MPa and 52.42 MPa, respectively. Besides, scanning electron micrographs show that FGN can regulate formation of massive compact cross-linking structures and thermo gravimetric analysis indicates that FGN can accelerate the hydration reaction to increase the function of the composite effectively.
基金Supported by Support Program for Women in Science,Engineering and Technology through the National Research Foundation of Korea funded by the Ministry of Science,ICT and Future Planning,no.2016H1C3A1903202
文摘AIM to evaluate gender differences in the aspect of ghrelin,nociception-related genes and psychological aspects and the quality of life(Qo L) in Korean functional dyspepsia(FD) patients.METHODS Total of 191 persons were prospectively enrolled between March 2013 and May 2016 in Seoul National Bundang Hospital,and classified into control and FD group based on ROME Ⅲ criteria. Questionnaire included assessment for dyspepsia symptoms,Qo L and anxiety or depression. Preproghrelin and nociception genes in the gastric mucosa and plasma acyl/des-acyl ghrelin were measured. RESULTS Lower level of plasma acyl ghrelin in FD patients compared to control was significant only in male(15.9 fmol/m L vs 10.4 fmol/m L,P = 0.017). Significantly higher m RNA expressions of nerve growth factor and transient receptor potential vanilloid receptor 1 were observed in male(P = 0.002 and P = 0.014,respectively) than in female. In contrast,female FD patients had a higher anxiety and depression score than male FD(P = 0.029),and anxiety score was correlated with epigastric pain only in female FD patients(female: Spearman rho = 0.420,P = 0.037). The impairment of overall Qo L was more prominent in female FD patients than male patients(5.4 ± 0.3 vs 6.5 ± 0.3,P = 0.020). CONCLUSION Gender differences of ghrelin and nociception-related genes in male and psychological factors in female underlie FD symptoms. More careful assessment of psychological or emotional status is required particularly for the female FD patients.
文摘Objective： Preservation of the pelvic autonomic nerves in order to lower bladder and sexual dysfunction after radical rectal cancer surgery ＆ to evaluate functional outcome, local recurrence. Methods： A prospective study was under- taken on Egyptian patients. Forty one patients participated in the study in the period from December 2002 till June 2004 where they underwent radical surgery but with preservation of the pelvic autonomic nerves this was followed by adjuvant pelvic radiotherapy. Results： Six months, 1-year and 2-year follow-up of urinary function was complete in 32 out of 41 （78%）, 30 out of 41 （73%） and 27 out of 41 patients （65%） respectively There was no statistically significant correlation between the extent of nerve preservation and the reported minor voiding dysfunction. None of the patients reported major incontinence. Six months, 1-year and 2-year follow-up of sexual function revealed that 22 out of 41 patients （53%） were sexually active. Three out of 41 patients （7.3%） developed local recurrence. 38 （92.7%） patients were free of local recurrence, regarding pa- tients who received adjuvant radiotherapy 3 out of the 34 （8.8%） patients developed local pelvic recurrence while 9 patients （26.5%） developed distant metastases （3 of them did not receive adjuvant chemotherapy）, while patients who received adju- vant chemotherapy, 2 out of 20 patients （10%） developed local recurrence while distant metastases developed in 6 patients （30%）. Conclusion： Preservation of the pelvic autonomic nerves minimizes bladder and sexual dysfunction especially in male patients after rectal cancer surgery.
基金Supported by Nanjing Provincial Science and Education Health Project:HL 07061
文摘Methods Two Qihai （气海 CV Objective To discuss the efficacy of acupuncture for groups of points were applied alternatively to 90 cases by chronic functional constipation acupuncture： （1） Tianshhu （CFC）. ST 25）, 6）, Shemgjfuxu （上巨虚 ST 37）, etc. （2）Zhongliao （中髎 BL 33）, Xiadiao （下髎 BL 34）, Dachangshu （大肠俞 BL 25）, etc. Electroacupuncture was applied in combination at Zhongliao （中髎 BL 33）, Xialiao （下髎 BL 34）, Tianshu（天枢 ST 25） and Shamgjuxu （上巨虚 ST 37）, once a day, 10 treatments made one session. By constipation diary of patients, frequency of going to stool, straining severity, time of once bowl evacuation, a sense of incomplete bowel emptying, stool quality, a sense of defecation and the Patient Assessment of Constipation Quality of Life questionnaire （PAC-QOL）, as well as the changes before and after treatment were observed. Results After treatment, the apparent improvements were achieved in frequency of going to stool, straining severity, time of once bowl evacuation, a sense of incomplete bowel emptying, a sense of defecation and score of PAC-QOL as compared with those before treatment （all P〈0.01）. The total effective rate was 67.7% （61/70）. The acupuncture effieacies were various on CFC of different dynamic mechanisms. The efficacy on slow transit constipation （STC） was superior to that caused by spastic pelvic floor syndrome （SPFS-C） （P〈0.05）, the efficacy on constipation caused by irritable bowel syndrome （IBS-C） was superior to that on either SPFS-C or constipation caused by relaxant pelvic floor syndrome （RPFS-C） （both P〈0.05）. Of 52 eases in effective follow-up, 1 month after treatment, 3 eases were cured, 6 eases markedly effective, 23 eases effective, and 20 cases failed; 3 months after treatment, 3 eases were cured, 5 eases markedly effective, 16 cases effective and 28 cases failed. Conclusion Acupuncture has definite efficacy on CFC with definite etiology, loci and diagnostic classification. But, the efficacies are different due to various dynamic mechanisms. A further optimized treatment program is required to improve the efficacy on SPFS-C and RPFS-C.
文摘OBJECTIVE:To examine the clinical effects of a mixture of Chinese Yam and Epimedium in patients with stable moderate or severe chronic obstructive pulmonary disease(COPD).METHODS:Forty-nine patients with COPD were randomly allocated to a group whose usual treatment was supplemented with oral Chinese Yam-Epimedium mixture,or a control group given placebo.For each patient,body mass index,airflow obstruction,dyspnea,and exercise capacity were measured and converted into the BODE index before treatment and at one and three months after initiation of treatment.Participants also completed the St George's Respiratory Questionnaire(SGRQ) at the same intervals.RESULTS:After one month,improvements were seen in the BODE index and SGRQ of participants taking Chinese Yam-Epimedium mixture compared to controls.There were statistically significant differences in the SGRQ:three of its components and the total SGRQ scores were significantly decreased(P<0.05),respiratory symptom scores had improved(P<0.01),and the dyspnea component of the BODE index had significantly decreased(P<0.05).Similar improvements were observed after three months of treatment,but exercise tolerance had also improved:the six-minute walking distance had significantly increased(P<0.05) in the treatment group when compared with controls.CONCLUSION:Chinese Yam-Epimedium mixture can significantly improve dyspnea,exercise capacity,and the quality of life of patients with stable moderate or severe COPD.
基金This work was supported by the National Natural Science Foundation of China(10300-210100218).
文摘Plant leaf litter decomposition provides a source of energy and nutrients in forest ecosystems.In addition to traditional environmental factors,the degradation process of litter is also affected by plant functional traits and litter quality.However,at the community level,it is still unclear whether the relative importance of plant traits and litter quality on the litter decomposition rate is consistent.A year-long mixed leaf litter decomposition experiment in a similar environment was implemented by using the litterbag method in seven typical forest types in Dongling Mountain,Beijing,North China,including six monodominant communities dominated by Juglans mandshurica,Populus cathayana,Betula dahurica,Betula platyphylla,Pinus tabuliformis and Larix gmelinii var.principis-rupprechtii and one codominant community dominated by Fraxinus rhynchophylla,Quercus mongolica and Tilia mongolica.The results showed that there were considerable differences in the litter decomposition rate(k-rate)among the different forest types.The community weighted mean(CWM)traits of green leaves and litter quality explained 35.60%and 9.05%of the k-rate variations,respectively,and the interpretation rate of their interaction was 23.37%,indicating that the CWM traits and their interaction with litter quality are the main factors affecting the k-rate variations.In the recommended daily allowance,leaf nitrogen content,leaf dry matter content,leaf tannin content and specific leaf area were the main factors affecting the k-rate variations.Therefore,we suggest that future studies should focus on the effects of the CWM traits of green leaves on litter decomposition at the community level.
