虚拟健身网络游戏集成同步技术

分布式虚拟现实技术应用于游戏领域,并和体育锻炼结合产生了虚拟健身网络游戏,其同步性问题影响这类游戏的可玩性.总结了影响同步性的因素,将同步算法分为保守和乐观两大类.利用人眼的视觉特征,通过变更对象的运动速度提出自适应同步算法,以提高同步性和响应性;从补偿网络延迟和减少带宽需求的角度,在服务器端和客户端分别采用兴趣管理和动态用户列表技术.实验结果表明了这种集成同步技术的可行性.     

简评赫尔左格和德梅隆设计的鸟巢与安联运动场

本文在对2008年北京奥运会主会场‘鸟巢’建筑设计的关注背景下,与同为赫尔佐格和德梅隆设计的德国慕尼黑安联运动场相比较。以共时性的批评模式,对不同建筑文化体系之间的两个建筑作品比较,以同一个设计团队中设计的两个不同作品比较,在不同的建筑文化体系中存在千丝万缕的联系。     

中国城市增长的类型及影响因素:基于人口和经济增长同步性的讨论

人口和经济的增长是城市增长最重要的两个方面。在城市的不同发展阶段,人口和经济的增长并不总是同步的,其增长的相对差异会体现为不同的城市增长型式。以中国地级及地级以上城市为研究对象,基于人口-经济增长的同步性划分中国城市的增长类型,并分析不同类型城市的增长特征及影响因素。研究发现,不同增长类型的城市反映了不同发展阶段的城市发展特征。城市发展初期,以显著的经济增长为特征,工业发展和地方专业化是城市经济增长的核心,而随着城市规模扩大,劳动生产率的提升不断吸引人口迁入和增长,人口和经济增长逐步实现良性互动,城市增长的正反馈机制形成。当城市达到较大规模时,城市经济的驱动逐步由工业转向服务业,城市经济转型,从生产型城市向消费型城市转变,经济的多样化和地方品质的提升成为驱动城市增长的核心。基于人口一经济增长同步性划分的城市增长类型有助于理解我国城市增长的路径,不同增长类型的城市应根据自身所处的发展阶段制定差异化的发展策略。     

Understanding Dynamic Collaboration in Teleconsultation

Information and communication technology has been widely deployed in the provision of healthcare for decades. Teleconsultation, one of the new means of providing healthcare solutions, has been prevalently implemented in numerous countries. In principle, it is expected with great potential to improve the effectiveness and efficiency of healthcare service through wide accessibility and cost control. However, many teleconsultation systems have been installed but abandoned rapidly or used at a disappointing low level. This paper explores the antecedents of low usage in post-adoption of teleconsultation service in clinical practice. We identify specific theoretical attributes targeted on the research problem and extend the Technology–Organization–Environment (TOE) framework into a multi-dimensional analytical framework. We design a comparative case study and conduct deductive analysis to test our propositions using data from multiple sources. The proposed analytical framework and empirical findings not only provide theoretical contribution by articulating the TOE framework to reflect the specific and distinguished characteristics in teleconsultation services, but also provide implications for practitioners to develop better strategies for teleconsultation collaboration.     

Multi-source information fusion and deep-learning-based characteristics measurement for exploring the effects of peer engagement on stock price synchronicity

By combining financial information from the financial market with social textual information from social media, we apply a two-level information fusion approach to examine the effects of peer engagement on social media on stock price synchronicity and compare the effects between epidemic and non-epidemic contexts. On the first level, single pieces of information are fused at the firm-year level and deep learning models are used to measure the characteristics of peer engagement – informativeness, diversity, information diffusion degree, and expert proportion – which are constructed grounded in the theory of the wisdom of crowds (WoC). On the second level, all measurements at the firm-year level are fused into a full sample to conduct regression analysis. The experimental results show that peer engagement reduces stock price synchronicity. This suggests that high synchronicity could be mitigated through effective guidance from peer engagement activities. We also find that during epidemics, synchronicity is much higher, and group diversity and experts have stronger effects in lowering synchronicity, while the effects of informativeness and information diffusion are hampered. This has implications for combatting the adverse effects of epidemic outbreaks on financial markets.     

耦合胰腺β细胞的同步性分析

胰腺β细胞在分泌胰岛素时会伴随生物放电活动。描述胰腺β细胞放电行为的数学模型有很多,为了理论分析的方便,本文采用具有代表性的三维多项式模型,对两个电耦合胰腺β细胞的同步行为进行了研究。通过构造恰当的李雅普诺夫函数,利用线性矩阵不等式、求解微分不等式获得了模型相应的全局渐近同步和全局指数同步的理论判据,并借助MATLAB进行数值模拟,进一步验证了理论结果的正确。     

高温型活性染料的性能与应用

高温型活性染料,色泽较鲜艳,色谱较齐全,固色率较高,色牢度也较好。尤其是具有对锦纶沾色少,对粘胶染深性好的优点。因此,可以弥补中温型活性染料在实用中的某些缺欠。     

无线传感器网络时间同步协议的改进策略

鉴于NTP和无线传感器网络时间同步协议的相似性,提出把NTP中的时间过滤、时间选择和时间组合算法简化后应用于无线传感器网络时间同步协议中以提高同步精度的策略.作为例证,将时间组合算法简化后引入BTS协议中.模拟的结果表明:在由81个Mica2节点组成的8跳网络内,除抗拒节点的同步误差保持不变外,其余节点的同步误差减小至改进前的67.70%～91.58%;具有相同跳距的节点的平均同步误差随跳距的增加率由19.8减小至15.5μs/跳;同时没有额外的报文开销.理论分析表明:同步精度的提高得益于应用时间组合算法所导致的节点时间偏移量均方差的减小.     

Auxin treatment of pre‐veraison grape (Vitis vinifera L.) berries both delays ripening and increases the synchronicity of sugar accumulation

Background and Aims: Pre‐veraison auxin treatments can delay grape berry ripening, but there is little information about their effects on berry development and wine composition. The aim of this study was to further investigate these effects and explore the practical implications of delaying ripening. Methods and Results: Treatment of pre‐veraison Vitis vinifera L. cv. Shiraz berries with 1‐naphthaleneacetic acid (NAA) significantly delayed ripening as measured by the accumulation of total soluble solids (TSS) and anthocyanins. The onset of the post‐veraison phase of berry size increase was delayed in NAA‐treated fruit, but these fruit were significantly larger than Control fruit at harvest. NAA‐treatments significantly increased the synchronicity of berry sugar accumulation. GC‐MS analysis of wine headspace volatiles showed significant, but largely small, differences in the concentration of 19 compounds. No significant difference in sensory properties was found between replicate small‐scale wine lots made from Control and NAA‐treated fruit. Conclusions: Auxin treatment delayed berry ripening, increased the synchronicity of sugar accumulation between berries, increased berry size and changed the levels of some volatile compounds, but did not affect wine sensory properties. Significance of the Study: We propose that NAA sprays might be used to delay grape berry ripening and increase the synchronicity of sugar accumulation, and therefore ripening, without deleterious effects on wine quality. This may be useful in controlling winery intake and fruit composition.     

Using wikis in team collaboration: A media capability perspective

Wikis are widely acknowledged to be capable of promoting team collaboration. However, previous studies have not examined how the characteristics of the wiki media influence team members’ perceived collaboration effectiveness in the educational context. Drawing on media synchronicity theory, we examine five wiki capabilities and whether these capabilities are perceived to be effective in facilitating collaboration. Results based on data from 83 undergraduate students in 15 teams show that reprocessability, no other wiki capabilities, plays a dominant role in securing a more favorable evaluation of collaboration effectiveness by students. The findings and their implications on theory and practice are discussed.