基于主成分分析和独立成分分析的调制分类算法

基于主成分分析（PCA）和独立成分分析（ICA）,提出了一种新的调制分类算法。算 法采用PCA对样本数据降维、去除冗余成分,采用FastICA方法提取分类特征;采用支持 矢量机（SVM）作为分类器,以解决数据在低维空间中的不可分问题。该算法具有较低的复 杂度和较高的训练速度。仿真表明,与最大似然（ML）算法相比,算法仅具有1.8 dB的信噪 比损失,在Rayleigh慢衰落信道和中速运动的条件下,算法对5种QAM调制类型具有较好的 分类性能。     

工业企业原材料采购与库存策略

本文针对一般工业企业在采购中面临的所购原材料多样性、复杂性问题 ,考虑原材料价格及与订单相关时间这两个因素 ,应用二维分类法对原材料进行分类 ,并根据不同的原材料特征提出了与之相适应的原材料采购与库存策略 ,从而形成企业低成本的原材料采购策略组合。     

我国商业银行信用风险压力测试研究

以不良贷款率作为衡量商业银行信用风险的主要指标,借鉴国内外的研究经验,采用LOGIT方法论构建我国宏观经济因素对银行信用风险影响的压力测试模型,并通过假设情景法进行宏观压力测试,定量评估了宏观经济变化对商业银行信用风险的冲击。研究表明,压力测试可以为我国商业银行信用风险管理提供有益的参考。     

高校教师流动中存在的问题及对策

高校教师作为高校最重要的人力资源,是提高教学质量、培养高素质人才的重要保证。由于经济社会发展等多方面的因素,教师聘用制度政策的改革,以及人们思想观念变化的影响,高校教师的流动已经成为不可避免的趋势。然而由于高校教师的流动,特别是高校教师无序流动现象的产生,严重影响到高校师资队伍的稳定及高校的可持续发展。文章以高校教师的流动为切入点,对高校教师流动的特点和原因以及现阶段存在的问题进行分析,从高校人力资源管理的角度,提出解决高校教师流动中存在问题的对策。     

计算机组装与维护课程建设的探索

《计算机组装与维护》是目前高职院校计算机专业普遍开设的一门专业技能课程,是计算机应用专业人才培养方案中的一门重点课程,而课程建设是提高教研室的教学水平和质量的一个重要标志。通过《计算机组装与维护》精品课程建设,从教学内容、项目化实践、教材建设、师资培养、组建学生团队及考评方式等方面进行改革与尝试,以期取得更大的发展。     

法治环境、城市化对生产性服务业发展的影响——基于省级面板数据的经验研究

加快发展生产性服务业是中国经济增长方式转变和产业结构优化调整的题中之义。本文利用省级面板数据检验了城市化进程和法治环境对生产性服务业发展的作用,计量回归结果显示：城市化进程对生产性服务业的发展具有显著的促进作用,并且通过了稳健性检验,但法治环境的作用不够显著;出口贸易和FDI抑制了生产性服务业发展。最后,文章根据计量检验结果解释了相应的政策。     

Clinical burden and healthcare resource utilization among patients with chronic hypoparathyroidism,overall and by adequately vs not adequately controlled disease: a multi-country chart review

Abstract

Aims: To assess the real-world clinical burden and healthcare resource utilization (HRU) among patients with chronic hypoparathyroidism, overall and by adequately controlled (AC) vs not adequately controlled (NAC) disease, informed by guideline-recommended clinical management targets, including biochemistry and symptoms.

Materials and methods: In this retrospective online chart review, endocrinologists in the US, Canada, the UK, France, Germany, Italy, and Spain were randomly selected to review the medical charts of adult patients with chronic hypoparathyroidism receiving calcium and activated vitamin D. Patients’ demographics, disease characteristics, symptoms, comorbidities, and hypoparathyroidism-related HRU during the 1 year before the review date were assessed. Clinical burden and HRU were compared between patients with NAC and AC hypoparathyroidism.

Results: Of 614 patients with hypoparathyroidism (AC, N?=?442; NAC, N?=?172), the mean age was 43.6?years, and the majority were female (61.6%), Caucasian (78.8%), and had post-surgical hypoparathyroidism (74.4%). Mean duration of hypoparathyroidism was 46.0?months. Hypoparathyroidism-related symptoms and comorbidities were reported in 59.4% and 46.7% of patients, respectively; 90.7% of patients had ≥1 hypoparathyroidism-related HRU event. More patients with NAC (57.6%) vs AC (42.5%) hypoparathyroidism experienced ≥1 comorbidity including calcium/phosphate imbalances, and brain, cardiovascular, metabolic, and renal disorders (all p?<?0.01). More patients with NAC vs AC hypoparathyroidism incurred ≥1 hypoparathyroidism-related hospitalization (27.9% vs 16.3%) and emergency room visits (47.7% vs 38.5%), and patients with NAC vs AC hypoparathyroidism had a higher number of outpatient visits (3.6 vs 2.6; all p?<?0.05), in the 1-year observation period.

Limitations and conclusions: Limitations of this online chart review include possible under-estimation of disease burden, limited sample size, and the inability to rule out selection bias. Findings indicate that patients with chronic hypoparathyroidism experience substantial symptomatic and comorbid burdens resulting in frequent HRU, suggesting an unmet need, particularly in NAC disease.     

新技术市场化商业模式设计--基于结构与情景视角

大量实践表明,新技术市场化成功的一个必要条件是设计并执行相匹配的新商业模式。然而,关于商业模式的性质与结构至今仍未达成共识,至于如何为特定的技术创新设计新商业模式的理论更是匮乏。针对上述问题,基于“价值定位-价值创造与保持-价值获取”的商业逻辑和系统设计思想,提出较完整的双层商业模式设计体系,并提出基于情景的多阶段商业模式设计过程,有助于创新者更好理解从技术创新中获利的一系列条件、商业模式的性质与结构,及如何探索新的商业模式,从而提高新技术市场化成功率。     

关于人口红利与刘易斯转折点问题的文献评述

改革开放30年,人口结构的转变为中国经济增长做出了重要贡献。而随着人口结构的深刻变化,人口红利是否正在消失和刘易斯转折点是否已经到来,近来备受瞩目。"未富先老"是人口结构快速转变与经济增长之间的突出矛盾。通过最新文献回顾发现,深入研究限制人口红利的制度和结构性因素显得更为重要,而刘易斯模型的适用性、中国经济社会现实的复杂性以及数据缺乏,是造成刘易斯转折点判断分歧的主要原因。因此,未来研究综合考虑这些因素,才能有助于作出科学判断。     

Family ownership,altruism and agency costs in Australian small- and medium-sized enterprises

Given the continuing uncertainty about whether family firms enjoy lower agency costs, this article hypothesizes that a combination of the effects of family ownership, altruism and self-control is instead at play. To begin with, family ownership can indeed reduce agency costs through better aligning the interests of owners and managers. This is a ‘determining’ effect in that it independently mitigates one source of agency problems. However, altruism combined with self-control problems arising from the highly concentrated ownership often found in family firms can also increase agency costs. This is an ‘embedding’ effect as it is rooted in the personal relationships within the family firm. Using the Business Longitudinal Database compiled by the Australian Bureau of Statistics on small- and medium-sized enterprises (SMEs), we find that for larger SMEs (those with 20–200 employees), the gains in lower agency costs arising from family ownership are almost completely offset by the losses from altruism and the lack of self-control.