电子政务服务外包潜在风险对其模式选择的影响研究

电子政务服务外包的成功很大程度上取决于外包模式的正确选择与潜在风险的有效掌控,研究其潜在风险对外包模式的影响对外包模式选择、风险防范具有较高的参考价值。在分析总结电子政务服务外包主要模式(BOT、BOO、BT、ASP)的关键成功因素和潜在风险因素的基础上,构建潜在风险影响外包模式选择的结构方程模型,分析"决策与合同管理风险"、"开发与运营管理风险"、"资金与成本管理风险"、"知识与战略管理风险"四类潜在风险对各外包模式的作用机制及影响程度,并依此提出外包模式选择的参考建议。     

"三农"难题成因:历史嬗变与现实探源

"三农"问题已成为中央政府与社会各界高度关注的社会焦点,"三农"问题能否顺利解决直接影响到中国农业的可持续发展与社会经济的全面进步。本文从历史检索与现实反思有机结合的视角,系统探讨了中国"三农"难题的四大成因,即:市场之因、制度之因、国情之因与政策之因,从而为"三农"难题的有效化解提供了基本的理论前提。     

集群企业外生性集体行动的影响因素效度检验

摘要：外生性集体行动是集体行动中最为常见的一种形式。通过理论梳理和对集群企业的实证研究发现集群企业外生性集体行动受到包括外生事件属性、反抗意识水平、外部资源支持力度、集体认同程度及组织水平等五个方面因素的影响。     

论民间融资中虚假诉讼的法律规制

民间借贷的蓬勃发展,不仅使得某些中小企业打破了现有金融体制的束缚获得发展所必需的资金,还为民间的闲散资金找到了更为有利的出路,但也为某些别有用心的人提供了兴风作浪的土壤,虚假诉讼在民间借贷领域中高频发生给经济的发展和社会稳定带来了恶劣的影响,为了更加有效地促进民间借贷的健康发展,需要对民间借贷中存在的虚假诉讼加强法律规制。     

关于运动协调能力若干问题的思考

运动协调能力是练习者形成运动技能必不可少的基础条件。分析了运动协调能力的定义、运动协调能力在形成运动技能中所起的作用、影响运动协调能力的因素、运动协调能力发展的一般规律、改进运动协调能力的任务与方法等问题。     

上肢康复机器人主动康复训练控制策略

近年来,脑卒中和交通事故造成上肢损伤的人数逐年上升,医疗领域对康复器械的需求越来越大。为满足实际需求,开发以气动人工肌肉为驱动器的4自由度（肩关节外收/内展（被动）、前驱/后伸、肘关节屈曲、腕关节屈曲）可穿戴上肢康复机器人。首先设计上肢康复机器人的结构,并采用气动人工肌肉作为肘关节与腕关节的驱动器。然后针对该上肢康复机器人,研究主动康复训练控制策略,设计两种控制策略。通过穿戴实验验证控制策略的有效性和实际应用价值。     

Physiological responses in different intensities of resistance exercise – Critical load and the effects of aging process

Aim was to identify critical load (CL) in young and elderly apparently healthy male cohorts. To contrast the metabolic, cardiovascular and perceptual responses on CL according to age. We evaluated 12 young (23 ± 3 years) and 10 elderly (70 ± 2 years) apparently healthy active males, who underwent: (1) 1 repetition maximum (1RM) test on a 45° Leg Press; (2) on different days, three high-intensity resistance exercise constant load tests (60%, 75% and 90% 1RM) until fatigue (Tlim). Absolute values of both the CL asymptote and curvature constant (kg) were significantly lower in elderly subjects (P < 0.05). In contrast, elderly subjects demonstrated a significantly higher number of repetitions at CL when compared with young subjects (P < 0.05). As expected, oxygen uptake (VO₂) and heart rate (HR) during maximal aerobic exercise testing were significantly reduced in older subjects. However, percent-predicted aerobic capacity were higher in older subjects (P < 0.05). In addition, blood lactate ([La^?]) corrected to Tlim and rating of perceived exertion values were greater in younger subjects at all intensities (P < 0.05). These findings, despite reduced force production in older subjects, endurance-related parameters are well preserved according to age-adjusted percent-predicted values in apparently healthy males.     

Combined effects of exposure to hypoxia and cool on walking economy and muscle oxygenation profiles at tibialis anterior

We investigated combined effects of ambient temperature (23°C or 13°C) and fraction of inspired oxygen (21%O₂ or 13%O₂) on energy cost of walking (C_w: J·kg^?1·km^?1) and economical speed (ES). Eighteen healthy young adults (11 males, seven females) walked at seven speeds from 0.67 to 1.67 m s^?1 (four min per stage). Environmental conditions were set; thermoneutral (N: 23°C) with normoxia (N: 21%O₂) = NN; 23°C (N) with hypoxia (H: 13%O₂) = NH; cool (C: 13°C) with 21%O₂ (N) = CN, and 13°C (C) with 13%O₂ (H) = CH. Muscle deoxygenation (HHb) and tissue O₂ saturation (StO₂) were measured at tibialis anterior. We found a significantly slower ES in NH (1.289 ± 0.091 m s^?1) and CH (1.275 ± 0.099 m s^?1) than in NN (1.334 ± 0.112 m s^?1) and CN (1.332 ± 0.104 m s^?1). Changes in HHb and StO₂ were related to the ES. These results suggested that the combined effects (exposure to hypoxia and cool) is nearly equal to exposure to hypoxia and cool individually. Specifically, acute moderate hypoxia slowed the ES by approx. 4%, but acute cool environment did not affect the ES. Further, HHb and StO₂ may partly account for an individual ES.     

我国男生引体向上“零”分探因:基于三角互证的研究策略

我国多数男生引体向上得"零"分,使上肢力量测评出现"地板效应"。采用量化研究和质性研究两种范式提高研究效度。量化研究对学生体质与健康调研数据和监测数据进行方差分析、多重比较和回归分析,结果表明：（1）每5~10年,男生的握力、体重、身高、BMI、引体向上均值差异显著;（2）年龄、握力、体重、身高、BMI分别显著预测引体向上成绩,体重和握力是影响我国男生引体向上成绩的主要影响因素。质性研究结果表明,引体向上"零"分主要有四个方面的原因：体重增长难挡,力量增长受限,个体认知偏差,社会支持薄弱。结论：我国男生引体向上"零"分的首要原因是体重增长较快,其次,主要肌群绝对力量和耐力增长不足,男生对引体向上的认知有偏差,学校、家长、社会支持较弱;借助政策控制体重、发展肌力、完善测评标准、促进男生积极练习引体向上十分重要。