基于项目集矩阵的AprioriHybral算法研究

介绍了AprioriHybral算法,针对算法前期工作效率的不足,提出一种基于项目集矩阵的改进算法ISMa-trix-AprioriHybral(ISMA).新算法(ISMA)主要从使用项目集矩阵生成一阶和二阶频繁项目集的角度,对Apriori-Hybral算法进行了优化.还对改进后算法的性能进行了简要的分析,最后通过使用实际数据的测试,验证了改进后算法的效率优于AprioriHybral算法.     

浅论新型农村合作医疗可持续发展的实现条件

新型农村合作医疗的可持续性发展需要农民的积极参与、政府责任到位并完善制度设计。只有加强农村医疗卫生基础设施建设,巩固和健全县、乡、村三级农村医疗卫生服务体系和网络,加强农村基层医疗卫生队伍建设,培养农村需要的医护人员,提高农村卫生医疗机构的服务质量,才能促进新型农村合作医疗的可持续性发展。     

Modelling fish trade liberalisation: Does fish trade liberalisation result in welfare gains or losses?

Recent research has on the basis of general equilibrium models warned that trade liberalisation in non-optimally managed renewable resources might cause over-exploitation and reduced steady-state welfare. Welfare effects of trade liberalisation in open access and optimal management are found case specific and dependent on factors such as the country's status as importer or exporter, the state of the fish stocks and the size of the countries on the world market. The present paper develops an alternative partial equilibrium framework capable of identifying welfare effects of fish trade liberalisation also in the presence of complex but realistic management schemes, such as regulated open access and regulated restricted access. The case dependency known from the general equilibrium analysis is confirmed, but the introduction of realistic fisheries management schemes in the partial equilibrium model extended this case dependency. The welfare effect of trade liberalisation in an exporter country is negative under open access, but was found positive under regulated restricted access in the present paper.     

Stakeholder objective preferences in Australian Commonwealth managed fisheries

Fisheries management is increasingly involving a wide range of stakeholders in the decision making process. However, in most fisheries, the set of management objectives are poorly defined, and the implicit importance placed on these objectives may vary considerably both between and within different stakeholder groups. This may lead to conflicts within management advisory groups where members from different stakeholder groups view potential management outcomes substantially differently, and inconsistencies in decision making when changes in stakeholder representation take place. In this paper, the institutional structure of fisheries management in Australia and the roles the different organisations play in shaping fisheries management plans are detailed. An explicit hierarchy of management objectives is developed in collaboration with key managers and policy makers. A large survey of stakeholders involved in Australian Commonwealth fisheries management was undertaken to determine stakeholder preferences relating to these objectives. The results highlight the differences in perspectives regarding the relative importance of the multiple objectives of fisheries management. While on average stakeholder preferences generally correspond with their expected preference set, the results also indicate that there is generally low coherence within stakeholder groups.     

The elephant in the room: The hidden costs of leasing individual transferable fishing quotas

Despite the increasingly positive reviews of individual transferable quotas (ITQs), few studies have considered how quota leasing activities can reduce the economic benefits to society and to fishermen operating under the ITQ fisheries system. This analysis reveals negative economic impacts of ITQs previously overlooked by examining the extent of quota leasing and the relationship between the catch value, the cost of fishing, and the quota lease price in the BC halibut fishery, long considered a poster child for ITQs. Findings challenge assumptions of economic theory used to promote the benefits of ITQs.     

基于邻接指数的空间关联规则挖掘方法研究

在空间关联规则挖掘中一般是采用遍历算法进行,导致对海量数据计算效率的降低。目前,空间数据挖掘模型多采用空间邻接矩阵来表达空间关联权重,大多情况下没有考虑邻接关系的实际量化的结果。文中在分析了空间实体分布的各种相邻关系基础上,采用邻接指数的方式来测算空间相关程度,并在此基础上采用改进的Apriori算法,通过自编程序加以实现。以北京市昌平区土地利用类型的空间分布关系为样例数据进行了试算。结果表明,计算效率有较大提高,并挖掘出一些潜在的土地利用类型间的共生关系。     

遥感信息协同智能网格模型设计及实现

为了给普通用户提供一个自动化、智能化的遥感信息处理平台,以OGSA(Open Grid Services Architec-ture)为基础,结合多智能体技术,提出了基于协同智能网格的遥感信息处理模型RSCIG(Remote Sensing Co-operative Intelligent Grid);设计了RSCIG的体系结构,详述了如何高效准确地协同现有的网格服务以完成所面临的任务;实现了一个RSCIG体系结构下的遥感信息处理原型系统。     

New Zealand seafood firm competitiveness in export markets: The role of the quota management system and aquaculture legislation

New Zealand's quota management system (QMS) was implemented in 1986 to address problems caused by a regulated open entry management system in place for the previous two decades. Excess capacity in the inshore fisheries caused several stocks to become depleted and conflicts to intensify between fishing sectors. The allocation of individual transferable quota (ITQ) was viewed as the best way to improve efficiency within the over-capitalised inshore fisheries and provide incentives for developing the deepwater fisheries. The expected benefits of the QMS fit with the political climate at that time, as the government was using market forces to address the deteriorating economy. This article outlines the results of a research project that involved four medium to large-sized, highly vertically integrated New Zealand seafood firms. The purpose of the project was to identify these firms’ sources of competitiveness in export markets and the process the firms used to develop sources of competitiveness, while adapting to rapid and radical changes to the political and business environment and transformation of the fisheries management system. The project's results show that the basis to seafood firm competitiveness is the security of supply to the fisheries resource provided by the QMS and aquaculture legislation. The project also outlines the role that government policies have in sustaining firm- and industry-level competitiveness. This article contributes to the broader discussion on the application of ITQ and other types of long-term access rights to the management of fisheries and does not express the views of the Ministry of Fisheries.     

The Occurrence of Ophiocnemis marmorata （Echinodermata： Ophiuroidea） Associated with the Rhizostome Medusa Rhopilema hispidum （Cnidaria： Scyphozoa）

The association of scyphomedusae with invertebrates has been long known in the literature; especially with hyperiidsamphipods.The association of echinoderms with jellyfish is not common and rarely recorded.We reported the association of theophiuroid Ophiocnemis marmorata with the rhizostome scyphomedusa Rhopilema hispidum collected in Vellar estuary (on thesoutheast coast of India).O.marmorata is supposed to be a filter feeding ophiuroid,quite common in soft bottom of shallow waters.The brittle stars possibly seek for food supply,shelter and protection through the association.     

The occurrence of <Emphasis Type="Italic">Ophiocnemis marmorata</Emphasis> (Echinodermata: Ophiuroidea) associated with the rhizostome medusa <Emphasis Type="Italic">Rhopilema hispidum</Emphasis> (Cnidaria: Scyphozoa)

The association of scyphomedusae with invertebrates has been long known in the literature; especially with hyperiids amphipods. The association of echinoderms with jellyfish is not common and rarely recorded. We reported the association of the ophiuroid Ophiocnemis marmorata with the rhizostome scyphomedusa Rhopilema hispidum collected in Vellar estuary (on the southeast coast of India). O. marmorata is supposed to be a filter feeding ophiuroid, quite common in soft bottom of shallow waters. The brittle stars possibly seek for food supply, shelter and protection through the association.