A Novel Framework for Human Activity Recognition with Time Labelled Real Time Sensor Data

Human activity recognition is an effective approach for identifying the characteristics of historical data. In the past decades, different shallow classifiers and handcrafted features were used to identify the activities from the sensor data. These approaches are configured for offline processing and are not suitable for sequential data. This article proposes an adaptive framework for human activity recognition using a deep learning mechanism. This deep learning approach forms the deep belief network (DBN), which contains a visible layer and hidden layers. The processing of raw sensor data is performed by these layers and the activity is identified at the top most layers. The DBN is tested using the real time environment with the help of mobile devices that contain an accelerometer, a magnetometer, and a gyroscope. The results are analyzed with the metrics of precision, recall, and the F1-score. The results proved that the proposed method has a higher F1_score when compared to the existing approach.     

Fast human activity recognition based on structure and motion

We present a method for the recognition of human activities. The proposed approach is based on the construction of a set of templates for each activity as well as on the measurement of the motion in each activity. Templates are designed so that they capture the structural and motion information that is most discriminative among activities. The direct motion measurements capture the amount of translational motion in each activity. The two features are fused at the recognition stage. Recognition is achieved in two steps by calculating the similarity between the templates and motion features of the test and reference activities. The proposed methodology is experimentally assessed and is shown to yield excellent performance.     

壳聚糖衍生物抗菌塑料制备与性能评价

采用水相悬浮聚合法合成壳聚糖接枝苯乙烯（CTS-g-St）抗菌剂，机械共混法制备了以LDPE为基体的抗菌塑料，采用红外光谱分析抗菌剂，扫描电镜观察材料断面，定量抗菌实验对抗菌塑料抗菌活性进行了测定，并测试了材料的力学性能。结果表明：苯乙烯单体成功接枝到壳聚糖分子上；改性壳聚糖与树脂间具有很好的相容性；抗菌剂添加量为2份时，抗菌塑料对大肠杆菌、枯草杆菌在24h、48h抗菌率均超过90％；抗菌剂的加入对材料力学性能无不良影响。     

Individual differences,exercise and leisure activity in predicting affective well-being in young adults

This study focuses on the prevalence of exercise and health-related leisure activities (smoking, drinking), across groups of subjects, defined by personality and gender, in relation to subjective well-being. Results from a cross-sectional survey of 187 participants are reported. Males (n = 80) reported more drinking (p < 0.001) and smoking (p < 0.001) than females, though they also reported higher habitual physical activity levels (p < 0.001). Females (n = 107) reported more frequent use of social support coping (p < 0.01). There was a positive association between extraversion and self-reported habitual physical activity as well as alcohol consumption (even when controlling for gender). Neuroticism was not related to any of the exercise and leisure activity variables. Multiple regression analyses predicted 34% of variance for the depression-enthusiasm and 39% of the variance for the anxiety-contentment measures of affective well-being. Neuroticism (p < 0.001) and avoidance coping (p < 0.05) were the only significant predictors of both anxiety-contentment and depression-enthusiasm. It is concluded that the influence of individual differences such as personality and gender on coping behaviour and well-being is consistent with social learning theory research. Limitations of cross-sectional research designs necessitate caution with inferring causal paths. Recommendations for future research are presented concerning the use and value of repeated measures designs within research into exercise and well-being.     

Crossing the line: A field study of inhabited television

This paper reports on an ethnographic field study of 'Out Of This World' (OOTW, Benford et al. 1999) an experiment in 'inhabited television' combining broadcast technologies with a collaborative virtual environment in a live show. The study focuses on the work of producing OOTW and how personnel managed the manifold contingencies of working with complex technology. The use of a specially developed virtual camera control application is discussed together with the methods the director used for live editing views from cameras into a 'broadcast from virtual reality'. The challenges faced by the multiple professions involved (TV personnel, research scientists, actors) are documented and the viability of inhabited TV as a 'new medium' is assessed. Future technological refinements are briefly discussed along with some general implications for CSCW and 'media studies' of the work reported.     

Work and fatigue characteristics of unsuited and suited humans during isolated isokinetic joint motions

The effects of a pressurized suit on human performance were investigated. The suit is known as an Extra-Vehicular Mobility Unit (EMU) and is worn by astronauts while working outside their spacecraft in a low earth orbit. Isolated isokinetic joint torques of three female and three male subjects (all experienced users of the suit in 1G gravity) were measured while working at 100% and 80% of their maximum voluntary torque (MVT, which is synonymous with maximum voluntary contraction (MVC)). It was found that the average decrease in the total amount of work (the sum of the work in each repetition until fatigue) done when the subjects were wearing the EMU were 48% and 41% while working at 100% and 80% MVT, respectively. There is a clear relationship between the MVT and the time and amount of work done until fatigue. Here, the time to fatigue is defined as the ending time of the repetition for which the computed work done during that repetition dropped below 50% of the work done during the first repetition. In general the stronger joints took longer to fatigue and did more work than the weaker joints. It was found that the EMU decreases the work output at the wrist and shoulder joints the most, due to the EMU joint geometry. The EMU also decreased the joint range of motion. The average total amount of work done by the test subjects increased by 5.2% (20.4%) for the unsuited (suited) case, when the test subjects decreased the level of effort from 100% to 80% MVT. Also, the average time to fatigue increased by 9.2% (25.6%) for the unsuited (suited) case, when the test subjects decreased the level of effort from 100% to 80% MVT. It was also found that the experimentally measured torque decay could be predicted by a logarithmic equation. The absolute average errors in the predictions were found to be 18.3% and 18.9% for the unsuited and suited subjects, respectively, when working at 100% MVT, and 22.5% and 18.8% for the unsuited and suited subjects, respectively, when working at 80% MVT. These results could be very useful in the design of future EMU suits and the planning of Extra-Vehicular Activity (EVA) for the future International Space Station assembly operations.     

关于加强企业经济活动监督工作的思考

企业经济活动监督工作往往存在着领导重视不够,不能全面参与;监察人员不够,不能全程参与;部门沟通不够,不能及时参与等不足。加强企业经济活动监督工作,要从组织上保证,加强纪委在经济活动中的监督地位;从制度上保证,加强纪律检查与管理工作有机融合;从机制上保证,加强纪委与业务部门联动联管合力。在开展经济活动监督工作时,要严格项目立项,实行项目管理集体决策;严格项目评审,规范业务管理操作程序;严格价格结算,及时审减项目开支费用;严格廉洁承诺,预防违纪违规问题发生。