窗墙比对室内热舒适性指标PMV影响的研究

通过建立数学模型进行数值模拟计算，在相同节能改造方案下，对窗墙比与热舒适性之间的变化关系进行了研究。研究表明：窗墙比为0.2时室内舒适性指标较高，但窗墙比为0.32和0.4时的室内舒适性指标基本相同，而且窗墙比为0.32时的室内舒适性指标稍小于窗墙比为0.4时的室内舒适性指标，这与通常窗户越小越舒适的说法有所不同。     

How offline retailers adopt O2O: Neighboring star shops and their proximity effect

For small to mid-sized offline retailers, a new e-commerce model called online-to-offline (O2O) enables the integration of physical and online channels through a platform-based aggregator. However, many offline stores are still reluctant to accept O2O. This study investigates how the existence of a neighboring star shop(s), defined as a shop that has generated large revenues in the early stage of O2O adoption, and the proximity to the neighboring star shops in offline settings matter in the initial adoption of O2O. We applied the Cox proportional hazard model, based on operating data from Naver Shop Window, an O2O service in South Korea. Our results show the existence of a neighboring star shop and the distance to it in offline settings are major determinants of O2O adoption. This study extends the academic discussions on the opinion leader's role in the offline environment to the O2O environment and provides strategic implications for practitioners who want to spread O2O.     

Analyzing the effects of storefront window display transparency on perceived store Attractiveness and Approach behavior

This study evaluated the impact of visual transparency vs. opaqueness in storefront window displays in relation to consumer responses and approach behavior. While there is extensive prior literature analyzing various design features in such exterior-facing displays, the ability to see through or around the window displays to observe the store interior has not received much research attention. Theories of cognitive processing fluency suggest that reductions in environmental “unknowns” are associated with feelings of pleasure, comfort, and environmental affinity. Thus, we hypothesized that more transparent window displays would be associated with higher ratings of store attractiveness, more time spent observing the stores, and a greater likelihood of participants approaching the stores after viewing the displays. The use of a virtual-reality approach made it possible to isolate and adjust the storefront display transparency while holding other environmental variables constant. Our findings confirmed that highly transparent window displays were associated with greater attractiveness ratings and longer durations of observation, and that these effects were mediated by a reduction in perceived visual complexity and increases in feelings of pleasure. We did not find a significant difference in approach behavior, but this may be due to the fact that our participants were aware they could not actually enter the stores in the VR presentation. The results provisionally indicate that retailers should attend to the visibility of the ground-level store interior when designing their window displays.     

一种低复杂度的多元LDPC译码算法

针对多元低密度奇偶校验（LDPC）码译码复杂度高、时延大等问题，提出了一种基于硬信息的低复杂度多元LDPC译码算法。来自信道的接收信号在初始化时，先进行非均匀量化预处理。在迭代过程中，校验节点端只需传输单个比特的二进制硬可靠度信息至变量节点。在变量节点端，可靠度信息按比特位进行简单的累加和更新，无需任何的系数修正操作。同时，变量节点使用了全信息的方式将信息传输至与其相邻的校验节点。仿真结果显示，与基于比特可靠度（BRB）的多元LDPC译码算法相比，提出的算法在较低量化比特情况下，能获得约0.3 dB的译码性能增益，且译码复杂度更低。     

深空接收机关键技术分析

通过对JPL、ESA等深空接收机技术进行研究,并结合当前国内信号处理技术发展状况,分析了深空接收机的诸多关键技术,从信号处理角度讨论了提高接收灵敏度的方法和适用技术,以解决深空微弱信号的捕获、跟踪和解调.着重介绍了微弱信号频率捕获、超窄带锁相环、边带辅助残留载波环、环路加窗技术、加权IDF、SSME信噪比估计技术、变环路带宽与变窗口技术等关键技术,对我国自主设备研制具有一定的参考价值.