摘要：Using directional antennas in Wireless Ad hoc Networks (WANETs) offers great potential of reducing the radio interference, and improving the communication throughput. Directional antennas, however, introduces new problems in the wireless Media Access Control (MAC), that is, the deafness and new hidden terminal problem, which may cause severe performance degradation. To solve the problems, we propose an effective Circular RTR Directional MAC (CRDMAC) protocol for WANETs by using a sub-transmission channel and Ready to Receive (RTR) packets, which modifies the IEEE 802.11 Distributed Coordinated Function (DCF). The sub-channel avoids collisions to other ongoing transmission, and the RTR packets notify the neighbor nodes that the mutual transmission has been finished. We evaluate the CRDMAC protocol through simulations and the results show that the proposed protocol outperforms existing DMAC (directional MAC) protocol and the CRCM (Circular RTS and CTS MAC) protocol in terms of throughput and packet drop rate.

摘要：地域性非物质文化遗产作为中华优秀传统文化的重要组成部分,承载着丰富的历史信息和独特的地域特色,是文化传承与创新的重要载体。其保护与传承不仅有助于增强文化认同感和民族自豪感,还能通过文创产品的开发,实现文化价值与经济价值的有机统一。基于文化三层次理论模型提炼非遗文创产品消费者需求要素,通过问卷调研和KANO模型分析,从本能层、行为层与反思层三个维度筛选出了基本型需求、期望型需求和魅力型需求共11项关键需求要素,并对各个需求要素进行了优先级排序,以此总结了地域性非遗文创产品的设计要点,以浙江省非物质文化遗产代表性项目李村抬阁为例完成了地域性非遗文创产品的设计实践,为地域性非遗文创产品的设计提供启示,实现非遗在当代的价值转化。

摘要：Traditional multi-band frequency selective surface （FSS） approaches are hard to achieve a perfect resonance response in a wide band due to the limit of the onset grating lobe frequency determined by the array. To solve this problem, an approach of combining elements in different period to build a hybrid array is presented. The results of series of numerical simulation show that multi-periodicity combined element FSS, which are designed using this approach, usually have much weaker grating lobes than the traditional FSS. Furthermore, their frequency response can be well predicted through the properties of their member element FSS. A prediction method for estimating the degree of expected grating lobe energy loss in designing multi-band FSS using this approach is provided.

摘要：《体育皇后》(1934)、《女篮五号》(1957)和《沙鸥》(1981)是中国体育电影史上不多的以女性为主要表现对象的三部故事片。本文以此三部有代表性的电影为例,分别从多重观看、身体规训和女性气质的角度探讨在三个不同历史阶段中,中国体育电影女性符号的表征关系和形态变化。

摘要：Over the sweep of China's 5,000year civilization, countless art treasures have been produced. These embodiments of the wisdom and skill of ancient Chinese are now attracting private collectors all over the world and provide rich resources for the country's steadily expanding auction ***, in the first years after

摘要：将PBL教学法应用于基础化学分析实验课程,详细阐述了PBL实验教学的课程设计理念,课堂实施方案,并归纳总结了课程建设过程的经验与不足。教学实践结果表明,采用PBL法进行化学分析实验教学,使学生成为实验教学过程的主体,可有效提高学生的学习积极性、实验动手能力及张卓旻*,黄路,李攻科*中山大学化学学院,广州510275自主学习能力。

摘要：结合学院"校中厂"校企合作的背景,本文对本校新成立的动漫设计专业的Photoshop课程教学改革进行了探讨,分析了课程在未改革之前存在的问题,根据新的课程设计理念和设计思路,结合"校中厂"校企合作的特点,制定了适用于动漫设计专业中的Photoshop课程的教学模块,阐明了新教学方法和课程的师资团队的建设,给出了课程考核方案。

摘要：借由杰弗里·巴瓦设计的坎达拉玛酒店与碧水酒店"服务与被服务"空间关系的探究,对路易·康提出的"服务与被服务"空间概念进行辨析,指出这一概念映射到建筑设计中的表现方式并不只有康所追求的"清晰的区分"这一种,巴瓦在设计实践中探索了一条以"多层级的空间"来调和极差,表达功能与形式、服务与被服务、空间等级关系的道路。

摘要：通过阐述现代儿童认知心理发展规律,结合调研结果,分析3~12岁儿童的认知心理和艺术表现的发展特点,获得儿童对食品包装在形象和色彩两方面的喜好,并据此指导儿童食品包装设计如何从形象与色彩两方面满足儿童的购买情感与心理需求。

摘要：动漫游戏产业作为文化创意产业的分支,受到越来越多的重视,国家在文化产业"十二五"规划中,将动漫游戏产业作为重要的组成部分,期间将大力发展。选取动漫游戏产业的主要技术——3D技术作为主要研究对象,从专利角度分析北京动漫游戏产业的优势、劣势、机会和威胁,针对性提出相关政策建议。研究表明,从专利角度进行产业现状及对策分析的研究思路是可行的,对其他产业研究具有借鉴意义。