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基于工程约束规则的层次推进布局算法 被引量:1
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作者 王启付 滕旭华 +1 位作者 王波兴 黄运保 《机械科学与技术》 CSCD 北大核心 2004年第10期1142-1145,共4页
以弯管机布局设计为背景提出了一种基于工程约束规则的层次推进布局算法。首先根据布局物体间的约束关系把布局物体分成若干布局层 ,然后对各布局层物体由高到低逐层进行布局 ,有效地降低了布局问题求解的复杂度。同时 ,在布局过程中引... 以弯管机布局设计为背景提出了一种基于工程约束规则的层次推进布局算法。首先根据布局物体间的约束关系把布局物体分成若干布局层 ,然后对各布局层物体由高到低逐层进行布局 ,有效地降低了布局问题求解的复杂度。同时 ,在布局过程中引进了工程约束规则 ,加快了布局问题的求解 ,布局结果更符合实际要求。 展开更多
关键词 布局 约束出度 约束入度 工程约束规则
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Institutional Constraints to the Competitiveness of the South African Citrus Exports
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作者 Portia Ndou and Ajuruchukwu Obi 《Journal of Agricultural Science and Technology(A)》 2013年第7期521-530,共10页
This paper examined the dual institutional constraints arising from the market liberalisation of the South African citrus industry and the stringent food safety health and private standards associated with the globali... This paper examined the dual institutional constraints arising from the market liberalisation of the South African citrus industry and the stringent food safety health and private standards associated with the globalisation of the agri-business industry. The aim of this paper was to explore the institutional challenges influencing the competitiveness of the South African citrus industry in the export markets. It also explored the implications of the institutional environment on market access. The logistic regression model was used to analyse the statistical data while simple ranking was used to indicate the new and emerging forces affecting the profitability of the industry in recent years. The results show that access to market information, economies of scale, compliance with strict food safety and quality standards, lack of proper infrastructure including transport and challenges of managing a business within the international business environment exerted significant effects on the competitiveness of the industry as well as the ability of domestic producers to enter the export markets. There is need for government intervention especially aligned to investing in infrastructure. Coupled with the support of private institutions, the government needs to support the exporters and producers in complying with private standards. 展开更多
关键词 Institutional constraints PERFORMANCE COMPETITIVENESS South African citrus industry export markets.
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