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This study explored the role of self-construal in moderating the effect of same- and varied-ad repetition on consumer response to advertising and brand on the basis of self-construal and encoding variability theory. In the study, subjects primed with independent or interdependent self-construal were exposed to either the same or varied ads. Findings indicate that, for foreground information in ad, independent self-construal subjects elicited more than interdependent self-construal subjects in same-ad repetition whereas there was no difference between independent and interdependent self-construal subjects in varied-ad repetition. However, for background information, interdependent self-construal subjects performed better than independent self-construal subjects in both same- and varied-ad repetition. In the case of brand recall, in varied-ad repetition, interdependent self-construal subjects recalled better than independent self-construal subjects did, whereas there was no difference between interdependent and independent self-construal subjects in same-ad repetition. It was also found interdependent self-construal subjects evaluated the target brand more positively than independent self-construal subjects did in varied-ad repetition. However, there was no difference in brand attitude between independent and interdependent subjects in same-ad repetition. 相似文献
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ZUO Dong-hong DU Xu YANG Zong-kai 《浙江大学学报(A卷英文版)》2007,8(8):1191-1198
Media streaming delivery in wireless ad hoc networks is challenging due to the stringent resource restrictions,po-tential high loss rate and the decentralized architecture. To support long and high-quality streams,one viable approach is that a media stream is partitioned into segments,and then the segments are replicated in a network and served in a peer-to-peer(P2P) fashion. However,the searching strategy for segments is one key problem with the approach. This paper proposes a hybrid ants-like search algorithm(HASA) for P2P media streaming distribution in ad hoc networks. It takes the advantages of random walks and ants-like algorithms for searching in unstructured P2P networks,such as low transmitting latency,less jitter times,and low unnecessary traffic. We quantify the performance of our scheme in terms of response time,jitter times,and network messages for media streaming distribution. Simulation results showed that it can effectively improve the search efficiency for P2P media streaming distribution in ad hoc networks. 相似文献
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Alex Mallett 《Al-Masaq: Islam & the Medieval Mediterranean》2012,24(3):241-252
This article examines the presentation of Muslim rulers from the early crusading period, 490–540/1097–1146 in six of the main chronicles written during the first half of the seventh/thirteenth century. It discusses the themes, ideas and topoi in each, demonstrating that the historians appear to have been divided into two ‘camps’ over their presentation of these rulers, based on their personal views of the rulers of their time. The article also examines why this division may have occurred, and considers its ramifications for modern scholarship of Arabic historiography, Islamic history and the history of the Crusades, in both the sixth/twelfth and seventh/thirteenth centuries. 相似文献
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Recent developments have shown that entity-based models that rely on information from the knowledge graph can improve document retrieval performance. However, given the non-transitive nature of relatedness between entities on the knowledge graph, the use of semantic relatedness measures can lead to topic drift. To address this issue, we propose a relevance-based model for entity selection based on pseudo-relevance feedback, which is then used to systematically expand the input query leading to improved retrieval performance. We perform our experiments on the widely used TREC Web corpora and empirically show that our proposed approach to entity selection significantly improves ad hoc document retrieval compared to strong baselines. More concretely, the contributions of this work are as follows: (1) We introduce a graphical probability model that captures dependencies between entities within the query and documents. (2) We propose an unsupervised entity selection method based on the graphical model for query entity expansion and then for ad hoc retrieval. (3) We thoroughly evaluate our method and compare it with the state-of-the-art keyword and entity based retrieval methods. We demonstrate that the proposed retrieval model shows improved performance over all the other baselines on ClueWeb09B and ClueWeb12B, two widely used Web corpora, on the [email protected], and [email protected] metrics. We also show that the proposed method is most effective on the difficult queries. In addition, We compare our proposed entity selection with a state-of-the-art entity selection technique within the context of ad hoc retrieval using a basic query expansion method and illustrate that it provides more effective retrieval for all expansion weights and different number of expansion entities. 相似文献
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Ad hoc网络在紧急事件、军事以及民用领域都得到了广泛的应用,但Ad hoc网络能量问题直接影响了Ad hoc网络的生命周期与节点生存时间,成为制约Ad hoc网络发展要解决的主要问题。该文针对这一问题,对网络路由协议中性能较好的DSR协议进行优化,提出基于能量控制的节能机制,对于路由发现Hello机制进行改进。给出局部自适应DSR路由协议的改进协议MMPEW-DSR（Maximum Minimum Power-Energy Weight）,优化后的协议减少了电池能量消耗,延长了网络的生存时间。 相似文献
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在车辆自组网络（VANET）环境中,当车辆从路边接入点（APs）下载文件时,可以利用移动节点之间的接触来携带/转发文件.本文提出了一种携带者选择算法,来增加车载下载者之间的传输速率的可能性.实验仿真表明,该方法可显著提高车载用户的下载速率. 相似文献
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根据无线Ad Hoc网络环境下P2P流媒体数据传输的特点,提出一种工作在P2P数据拓扑层面的,不依赖于底层物理网络的节点配置和特定的路由算法的优化传输方案.在发送数据时,节点结合应用层视频分片的重要性和网络状况动态地调整传输层参数,从而减小重要数据的传输延时和播放超时的概率.仿真结果验证了本方案对于改善服务质量和减小控制信令开销的有效性. 相似文献
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传统的MAC层EDCF协议在无线自组网有广泛应用,但EDCF的BEB退避算法未考虑自组网多跳性的特点,对所有的数据用同样方法分配退避窗口,结果导致剩余跳数多的数据时延大幅增加.对BEB算法进行了改进,对剩余跳数多的数据分配较小的退避窗口,增强信道接入竞争力,并用OPNET对算法进行了仿真.仿真表明,改进后的MAC接入机制能有效降低端到端时延. 相似文献
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针对Adhoc网络中移动节点能量受限的问题,考虑节点剩余能量和节点能量消耗速率两方面因素,对AODV协议,在选路机制,hello机制几个方面作了改进,改进后的路由协议能够有效均衡负载,保护低能量节点,延长网络生存时间。 相似文献