等重码构建的多脉冲位置调制UWB通信系统

在已有的单脉冲位置调制的基础上,利用等重码构建了一种多脉冲位置调制的UWB跳时调制方案;并对其AWGN下的信道容量、误码率等性能指标进行了理论分析。数值结果表明,在满足一定的条件下,MPPM能以较低的接收机复杂度在数据容量、误码率等指标上获得比相应的脉冲位置调制及脉冲幅度调制更高的性能,可以作为UWB高速通信应用的一个很好的备选调制方案。     

基于违约鉴别能力组合赋权的小企业信用评级——基于小型工业企业样本数据的实证分析

信用评级是衡量债务违约的可能性,因此评级体系要有违约风险识别能力,能够将违约客户和非违约客户显著地区分开.通过逼近理想点的思路,构建多目标规划模型求解最优的组合权重,并对中国某区域性商业银行1 814笔小型工业企业贷款进行实证分析.本文的创新与特色一是以非违约企业的数据到正理想点的距离代数和最小为第一个目标函数,以违约企业的数据到负理想点的距离代数和最小为第二个目标函数,构建多目标非线性规划模型进行组合赋权,在满足了“非违约企业的评价得分越高、违约企业的评价得分越低”要求的目标下得到最优的组合赋权的权重系数,使赋权结果保证了评级模型能够将违约企业与非违约企业最大地区分开.改变了现有研究的组合赋权脱离评价目的的弊端,改变了现有研究中违约与非违约企业的评价得分存在大量重叠、对两类企业的区分能力低的弊端.二是通过检验“违约企业的信用得分是否显著小于非违约企业的信用得分”的J-T非参数检验,验证信用评价模型的合理性.改变现有研究忽略对信用评价模型的合理性进行验证的弊端.三是经过实证,发现本研究建立的组合赋权模型的违约鉴别能力(Z=5.546)要高于现有研究的两种常用组合赋权模型、即基于方差最大的组合赋权(Z=4.298)和基于偏差最小的组合赋权(Z=5.182)     

同股同权同价模式解决国有股流通

解决国有股流通的问题 (实际上包括不能流通的国有股和企业法人股两部分 ,以下同 )必将引发我国证券市场上一次深刻的变革 ,将对证券市场产生极其深远影响。我们本着公平公正的原则提出了同股同权同价的定价模式 ,选取了几个典型的样本进行了处理 ,计算了全面流通对整个市场的影响 ,并与净资产的定价模式进行了比较分析。     

Caesarean delivery before 39 weeks associated with selecting an auspicious time for birth in Taiwan

BackgroundCaesarean delivery before 39 weeks of gestation increases the risk of morbidity among infants. Taiwan has one of the highest caesarean rates in the world, but little attention has been paid to this issue. This study aimed to describe the rate of caesarean delivery before 39 weeks gestation among women who did not have labour signs and had a non-emergency caesarean delivery in Taiwan and to examine whether the phenomenon was associated with the Chinese cultural practice of selecting an auspicious time for birth.MethodsWe recruited women at 15–28 weeks of pregnancy at 5 hospitals in northern Taiwan and followed them at 4 or 5 weeks after delivery using structured questionnaires. This analysis included 150 primiparous mothers with a singleton pregnancy who had a non-emergency caesarean delivery without the presence of labour signs.ResultsNinety-three of these women (62.0%) had caesarean deliveries before 39 weeks of gestation. Logistic regression analysis showed that women who had selected an auspicious time for delivery (OR = 2.82, 95% CI: 1.15–6.95) and delivered in medical centres (OR = 5.26, 95% CI: 2.25–12.26) were more likely to deliver before 39 weeks of gestation.ConclusionNon-emergency caesarean delivery before 39 weeks of gestation was common among the study women, and was related to the Chinese cultural practice of selecting an auspicious time for birth. Further studies are needed to examine the risks and benefits associated with timing of caesarean delivery in Taiwan in order to generate a consensus among obstetricians and give pregnant women appropriate information.     

Factors associated with early cessation of breastfeeding in women with gestational diabetes mellitus

AimTo determine factors associated with early cessation of breastfeeding (≤3 months) in women with recent gestational diabetes mellitus (GDM).MethodsA cross-sectional online survey of women aged ≥18 years, diagnosed with GDM in 2010 and registered with the National Diabetes Services Scheme in Australia. The 59 questions examined breastfeeding duration, intention, attitudes, exclusivity and support.Results738 women completed the survey (15% response rate). Data was analysed for 729 eligible respondents. Of these 97% reported ‘ever’ breastfeeding and 19% had breastfed for ≤3 months. Cessation of breastfeeding at or before 3 months was associated with breastfeeding problems at home [adjusted odds ratio 8.01, 95% confidence interval (4.57, 14.05)], return to work prior to three months [OR 3.39 (95% CI 1.53, 7.55)], inadequate breastfeeding support [OR 1.88 (95% CI 1.10, 3.22)], caesarean delivery [OR 1.70 (95% CI 1.04, 2.76)], low socioeconomic status (SEIFA 1 unit increase) [OR 0.89 (95% CI 0.81, 0.97)] and BMI (2 unit increase) [OR 1.08 (95% CI 1.01, 1.57)]. Being married or de facto [OR 0.14 (95% CI 0.03, 0.62)] was a protective against early cessation of breastfeeding.ConclusionStrategies to improve breastfeeding duration in women with GDM need to address those most at risk of early cessation and provide appropriate postpartum breastfeeding support in this group.     

中国省域创新创业环境评价指标体系的构建研究——对全国31个省级单位的测评

围绕创新创业环境的内涵,梳理了影响创新创业环境的六类主要因素,归纳潜在指标;对各潜在指标进行"聚类—因子—权重"综合分析,提炼影响创新创业环境的主要因子,构建出以6个一级指标和20个二级指标为核心的创新创业环境评价指标体系,并建立评价模型。以中国各省为样本,对全国31个省级单位的创新创业环境在2014年的状况进行测评排序。依据各省创新创业环境综合得分情况,得出全国31省2014年创新创业环境的地理空间分布图。分地区评价结果显示,东部地区创新创业环境具有明显优势,中部、东北和西部地区发展空间较大。从准则层指出各个地区优化创新创业环境的着力点。     

Tracking weight change,insulin resistance,stress, and aerobic fitness over 4 years of college

Objective: To determine if weight gain is accompanied by development of insulin resistance (IR) during 4 years in college. Participants: Two cohorts of college students were enrolled in fall semesters 2009 and 2010 and tracked for 4 years. Methods: Following a 12-hour fast, subjects reported for measurement of body mass index (BMI), perceived stress (PSS), aerobic fitness, and blood glucose, insulin, and lipids. Results: In the first year, 33% of subjects were overweight or obese, and 20% were hyperinsulinemic. Year 4 had 29 remaining subjects with disproportionate attrition of overweight and obese individuals. Just over half the subjects gained weight (WI), whereas nearly 30% lost considerable amounts (WD). WD showed significant decline in fasting insulin, low-density lipoprotein (LDL) cholesterol, and PSS from year 1. WI was primarily highly fit men who did not demonstrate increased IR. Conclusion: WI was not associated with IR over 4 years of college.     

“I am a fat baby,who moved to a fat child,who moved to a fat teenager,who moved to a fat adult”: Women’s reflections of a lifetime of body and weight concern

The present study explored how women aged 50–65 years reflect and make meaning of a lifetime of body and weight struggles. Seven purposefully selected women with longstanding body image challenges participated in interviews and reflected on their perceptions, thoughts, and emotions around their body and weight since childhood. Findings revealed consistent and consuming concerns about the body; prevalent body-related self-conscious emotions; influential social experiences that impact physical self-perceptions; and enduring impacts of weight bias, stigma, and discrimination. Collectively, these findings provide support for the stability of body disturbances and highlight the need to explore the unique body-related narratives of women in midlife.     

提高体育考试权重扭转学生体质下降趋势

本文以博弈论为工具分析体质健康利益各方，得出“片面追求升学率”是动态博弈的必然结果。在考试招生制度变动不大预期下，建议加大体质健康测评在各级考试招生中的权重，以扭转学生体质下降趋势。