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随着环保要求的增强,需要在评价能源利用项目时考虑环境效益。通常的环境效益评估只能定性的要求排放达标,或者从经济的角度计算环境的外部成本。本文在此提出采用丈月分析方法,对大气污染物自然清除过程的史用损失进行计算,从而将能源和环境定量结合起来,以综合评价一个能源利用项目的优劣。 相似文献
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Abstract Multi-core digital signal processors (DSPs) are widely used in wireless telecommunication, core network transcoding, industrial control, and audio/video processing technologies, among others. In comparison with general-purpose multi-processors, multi-core DSPs normally have a more complex memory hierarchy, such as on-chip core-local memory and non-cache-coherent shared memory. As a result, efficient multi-core DSP applications are very difficult to write. The current approach used to program multi-core DSPs is based on proprietary vendor software development kits (SDKs), which only provide low-level, non-portable primitives. While it is acceptable to write coarse-grained task-level parallel code with these SDKs, writing fine-grained data parallel code with SDKs is a very tedious and error-prone approach. We believe that it is desirable to possess a high-level and portable parallel programming model for multi-core DSPs. In this paper, we propose OpenMDSP, an extension of OpenMP designed for multi-core DSPs. The goal of OpenMDSP is to fill the gap between the OpenMP memory model and the memory hierarchy of multi-core DSPs. We propose three classes of directives in OpenMDSP, including 1) data placement directives that allow programmers to control the placement of global variables conveniently, 2) distributed array directives that divide a whole array into sections and promote the sections into core-local memory to improve performance, and 3) stream access directives that promote big arrays into core-local memory section by section during parallel loop processing while hiding the latency of data movement by the direct memory access (DMA) of a DSP. We implement the compiler and runtime system for OpenMDSP on PreeScale MSC8156. The benchmarking results show that seven of nine benchmarks achieve a speedup of more than a factor of 5 when using six threads. 相似文献
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污染减排的合理补偿方法的探索 总被引:1,自引:0,他引:1
为了推广清洁能源利用技术 ,不仅要对重污染企业进行罚款 ,还应该对排污少的企业进行适当的奖励或补偿。基于大气环境容量分配模型和大气污染物的社会平均边际削减成本计算 ,提出了一种电力行业中如何计算污染减排量 ,以及减排补偿的方法 ,以利于环境的改善 相似文献
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