Shape-constrained Gaussian process regression for surface reconstruction and multimodal,non-rigid image registration

We present a new statistical framework for landmark ?>curve-based image registration and surface reconstruction. The proposed method first elastically aligns geometric features (continuous, parameterized curves) to compute local deformations, and then uses a Gaussian random field model to estimate the full deformation vector field as a spatial stochastic process on the entire surface or image domain. The statistical estimation is performed using two different methods: maximum likelihood and Bayesian inference via Markov Chain Monte Carlo sampling. The resulting deformations accurately match corresponding curve regions while also being sufficiently smooth over the entire domain. We present several qualitative and quantitative evaluations of the proposed method on both synthetic and real data. We apply our approach to two different tasks on real data: (1) multimodal medical image registration, and (2) anatomical and pottery surface reconstruction.     

异构小蜂窝网络移动性管理研究综述

新一代移动通信网络不断演进为高密集、无定型、立体分层的异构网络,移动性管理旨在保证用户设备（user equipment,UE）移动通信服务的连续性和无缝切换及降低信令开销等。移动性管理问题正成为异构小蜂窝网络（heterogeneous and small cell networks,HetNets）中无线资源管理需要应对的关键性挑战之一。阐述了移动性管理的一般性问题,根据移动性管理的主要特征给出了一个综合分类：整体切换性能增强、小蜂窝发现与识别增强和无线链路失效（radio link failure,RLF）恢复增强。此外,依据此分类对近年来第三代合作伙伴计划（3rd genera-tion partnership project,3GPP）成员在无线接入网（radio access network,RAN）标准化工作组历次会议中提出的主要移动性管理增强方案进行了分类阐述和性能对比。对异构小蜂窝网络的移动性管理所面临的挑战和未来研究的趋势进行展望,并在此基础上进行了总结。     

An efficient two-stage randomized response model under stratified random sampling

A two-stage randomized response model is extended to stratified random sampling in order to find out more efficient estimators of proportions built from sensitive questions, which respondents may not answer truthfully, in a population divided into homogeneous subgroups. In each subgroup, the respondents who have not answered the sensitive question in the first stage are requested in the second stage to either answer the sensitive question (second attempt then) or to draw a card indicating “yes” or “no”. In the latter case, they are required to report the outcome. Such extension provides a more efficient estimator of the proportion of the population having a given sensitive attribute than its counterpart in simple random sampling. The extended two-stage randomized response model is more efficient than the stratified randomized response model, where respondents must answer the sensitive question either in the first or in the second stage. Moreover, it increases the respondents’ cooperation. When strata weights are unknown, they are estimated by the double sampling method.     

论经济适用房政策中的政府失灵

政府失灵指的是政府旨在解决市场失灵的政策所导致的自身失灵,即该政策既未实现公平,又未实现效率。政府旨在解决中低收入人群住房问题的经济适用房政策就是如此。      

氟伐他汀对慢性心力衰竭患者血浆脑钠肽的影响

目的观察氟伐他汀对慢性心力衰竭（CHF）患者临床及血浆脑钠肽（BNP）水平的影响。方法100例CHF患者随机分为两组：对照组48例患者给予抗心力衰竭的常规治疗;治疗组52例在对照组基础上加用氟伐他汀钙治疗。两组均治疗6个月。两组分别于治疗前及治疗6个月后测定左室舒张末期内径（LVEDd）、左室射血分数（LVEF）及血浆BNP水平。同时观察临床症状、体征及药物不良反应。结果治疗6个月后治疗组总有效率显著高于对照组（P〈0.05）;治疗组的LVEDd、LVEF及血浆BNP水平的改善优于对照组（P〈0.05）。结论CHF患者在常规治疗同时加用氟伐他汀治疗,可以显著降低血浆BNP水平,增加LVEF,改善心功能。     

服务补救时机对消费者情绪和行为意向的影响

采用情景模拟方法,以航空和宾馆服务失误与补救为例,分别测评了即时补救、事后补救和事后延时补救对消费者情绪和行为意向的影响,结果发现：首先服务补救时机对消费者情绪和行为意向有显著影响,补救时机越早,消费者积极情绪、口碑传播和重购意向就越高,而消极情绪就越低;反之则相反。其次,获得服务补救消费者的积极情绪与口碑传播和重购意向呈显著正相关,消费者消极情绪与口碑传播和重购意向呈显著负相关。最后,消费者口碑传播与重购意向呈显著正相关。     

项目投资的风险分析与度量研究

通过对随机NPV的风险分析,研究了项目投资的风险及其度量问题,确定计算风险当量系数α和风险补偿率r的函数,在此基础上采用期望值和风险函数等数量指标,建立了长期项目投资的风险决策方法。     

“星光计划”：作为一项老年社会福利政策的实施效果评析

为了应对我国人口老龄化的挑战及更好地满足老年居民的需求,自2001-2004年间,民政部在全国推行了"社区老年福利服务星光计划",旨在依托社区,为社区老年人提供多种福利服务.论文将以系列政策文本为基础,结合对J市"星光老年之家"运行情况的跟踪调查及检索到的相关文献资料,简要回顾"星光计划"的政策背景、政策目标和政策实施效果,并重点分析其政策实施困境,进而提出几点看法.