Solesolevaki as social capital: a tale of a village,two tribes,and a resort in Fiji

This paper advances understanding of the complex and adaptive nature of indigenous Fijian communities involved in tourism. It examines how tourism-related development has set the people of one Fijian village along two separate development pathways, and explores how preferential access to tourism benefits has created disparities within the community. Complex Adaptive Systems theory and Social Capital theory are used to conceptualise how over 40 years of tourism involvement has influenced development within an indigenous Fijian community. The findings argue that indigenous Fijian communities are non-homogeneous entities, which are constantly in transition, responding and adapting integratively to both internal and external changes over time. The findings show that the emergence of new behaviours and ways of life has led to the collapse of the pre-existing systems of social capital. As a response, community members retreated and regrouped, strengthening internal bonds and social capital in their smaller social units, leading to both dependency and opportunity-seeking behaviours among participants. Ultimately, the paper asserts that money alone does not lead to development, but rather tourism and access to a variety of capital do.     

水生态系统服务供需视角下的水网乡村 适应性规划策略——以吴江张鸭荡片区为例

苏南乡村地区一直是中国乡村建设的先行区域，特殊的纵横交错的水网结构构成了一个错综复杂的系统，呈现出其他地区不具有的复杂性和生态特殊性。随着城镇的扩张，乡村的发展建设使其水网空间的平衡发展面临极大的挑战。传统单一静态的规划方法逐渐显示出无法适应经济、社会等发展要求的缺陷。苏南乡村地区以水为核心，从水生态系统服务供需关系的视角下探究水网乡村的适应性规划策略更加适应当前的乡村现状和需求。以传统水网乡村空间形态转译为基础，建立水生态系统供需服务评估体系，在评估水生态系统服务供需能力的基础上，分析供需分异模式及供需矛盾。从构建乡村水域空间生态格局、乡村水域空间功能分区规划，以及乡村水域空间多情景预判3个方面，提出苏南水网乡村的适应性规划策略，并为水网乡村的生态实践提出新思路。     

Ad hoc网络中基于多波束天线的集中式低时延调度算法

UxDMA算法是一种高效的集中式算法，是用于时分多址、频分多址和码分多址信道分配的统一算法。在UxDMA的基础上，利用多波束天线的多波束形成能力，针对低时延定向ad hoc网络提出了一种集中式调度算法——CLSM(Centralized Low-delay Scheduling Algorithm Based on Multi-beam Antennas)。CLSM通过不同时延等级限制的报文来比较着色后发送链路的优先级，优先选择高优先级链路传输。通过仿真验证了CLSM的性能：与UxDMA相比，该算法在多时延限制的发送端调度中表现出了更好的吞吐量和时延性能。     

多波束移动卫星系统的自适应开环预编码方法

对于卫星移动通信系统，由于卫星与地面终端之间的相对运动以及星地间传输延迟，传统的基于理想信道信息的预编码方法是不适用的。针对这一问题，提出了一种基于开环信道估计的预编码方法。卫星端利用开环获取的部分信道信息实现多波束联合预编码，并导出了系统传输速率的闭合解析表达式。此外，为了克服强干扰环境下多波束预编码系统性能恶化问题，提出了一种自适应预编码传输方法。卫星发射机依据开环获得的慢时变用户位置信道信息和信道统计量信息，自适应地选择预编码方法或传统频率复用方法，实现最优的系统性能。理论分析和仿真结果表明，与传统的干扰抑制方法相比，所提方法能实现更优的系统性能，同时也克服了传统预编码方法的局限性。     

Responses to COVID-19: The role of performance in the relationship between small hospitality enterprises’ resilience and sustainable tourism development

Tourism is one of the hardest-hit industries by the global pandemic of Novel Coronavirus (COVID-19). Small tourism enterprises have been heavily affected and have had difficulty in business recovery. This research is an early attempt to explore the direct impact of small hospitality enterprises’ resilience on sustainable tourism development as well as indirect impact through performance. A pre-tested questionnaire survey was self-administered to owner-managers of small hospitality enterprises in Greater Cairo, Egypt. The results of structural equation modeling (SEM) using AMOS showed a positive, direct, and significant impact of resilience (planned and adaptive) on sustainable tourism development and indirect influence through performance. The results of the multi-group analysis showed that enterprise type has a significant effect on the results, where restaurant owner-managers expressed more resilience than their hotel counterparts. Several theoretical (for scholars) and practical implications for tourism policy-makers and owner-managers have been discussed and elaborated.     

Fijian culture and the environment: a focus on the ecological and social interconnectedness of tourism development

Understanding the complex and adaptive nature of Pacific Island communities is a growing yet relatively unexplored area in the context of tourism development. Taking an ethnographic research approach, this study examines how over 40 years of tourism development have led to complex and multi-scale changes within an Indigenous Fijian village. The study establishes that tourism development has brought a range of ecological shifts that have, over time, spurred far-reaching changes within the embedded sociocultural constructs of the community. The development of the Naviti Resort, a water catchment dam, a causeway and a man-made island have created substantial changes in totemic associations, livelihood approaches, and traditional knowledge structures within Vatuolalai village. The emergence of internal adaptive cycles, and new behaviours, practices and values that redefine the cultural landscape will be discussed. This paper demonstrates the interconnectivity of nature, society and culture within Indigenous communal systems and asserts that ecological changes introduced in one part of a community stimulate complex, non-linear responses in other elements of the socio-ecological system of a Fijian village.     

全空域球面相控阵波束形成器的优化设计

针对目前全空域球面相控阵测控系统工程应用中波束数量、信号瞬时带宽等数字波束形成器性能和复杂度难以兼顾的问题，分析了常规波束形成方法在基于半球形结构的S频段大型共形天线阵列工程应用中的局限，给出了一种基于子阵划分的宽带数字波束形成器优化设计方法，通过优化幅相和时延补偿方式，使算法不受子阵尺寸限制，工程实现复杂度较低。系统建模和仿真验证表明该方法可以获得良好的瞬时带宽性能，具有较好的工程应用价值。     

GNSS抗干扰技术综述

随着电磁环境的日益复杂、干扰技术的不断进步，全球卫星导航系统（Global Navigation Satellite System，GNSS）的各类应用受到了严重阻碍，在强干扰环境中，扩频增益不足以对干扰进行有效抑制，需采用各种抗干扰措施。对GNSS抗干扰技术进行了分类，概述了不同抗干扰技术的研究现状及进展，并对GNSS干扰源与干扰类型进行了归纳总结，给出了不同干扰类型对应的抗干扰方法，进一步对比分析了几类常见自适应算法的性能，最后指出了GNSS抗干扰技术未来的研究趋势。     

一种基于量子加密的软件定义网络南向安全防护策略

提出一种以量子加密技术为核心的软件定义网络（Software-defined Network，SDN）的南向安全防护策略，建立了基于量子密钥分发的SDN网络模型并分析了该模型下的身份认证、量子密钥分发和自适应免疫窃听流程。推导出了本策略下窃听攻击强度、用于检测窃听的量子态数目的比例α、系统发现窃听者的概率、密钥分发效率之间的定量关系。通过动态仿真分析确立了不同攻击强度下系统参数α的最优选值区间。SDN控制器可根据该仿真结果，动态地决策系统中α的取值进行自适应免疫密钥分发，实施更为精准的窃听免疫方案。     

一种利用均匀圆阵对称特性的近场源酉变换估计算法

针对现有均匀圆阵的近场源三维参数估计算法运算量大的缺点，提出了一种基于均匀圆阵对称特性的近场源酉变换估计算法。该算法利用均匀圆阵对称特性将阵列导向矢量进行酉变换和对角化分离处理，消除距离参数，把三维搜索问题化简为二维搜索问题，同时把复值方向矢量转化为实值方向矢量。计算机仿真结果显示,所提算法估计性能优于相关序列降维估计方法，与三维多重信号分类算法性能相当，且通过矩阵分离降维和实值化处理，减少了运算量，有利于工程实时处理。