| 61. |
- Jafari, Fahimeh, et al.
(författare)
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Optimal Selection of Function Implementation in a Hierarchical Configware Synthesis Method for a Coarse Grain Reconfigurable Architecture
- 2011
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Ingår i: Proceedings. ; , s. 73-80
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Konferensbidrag (refereegranskat)abstract
- We have proposed a Dynamically Reconfigurable Resource Array (DRRA), which is a Coarse Grain Reconfigurable Architecture (CGRA). In this paper, we propose a hierarchical method for compiling DSP applications in Simulink into DRRA. In this method, each function in DRRA library can be implemented in different architecture styles and also each architectural style can be implemented in varying degrees of parallelism. Since selecting an appropriate implementation for functions of an application is very effective in performance and cost of architecture, we also formulate an optimization problem that considers implementations of functions as decision variables in order to minimize total energy consumed in the architecture under performance and cost constraints. A realistic case study exhibits up to 89% reduction of total energy consumption. It is worth mentioning that by using the proposed hierarchically compilation method, the design space is reduced dramatically while keeping the solution optimized in term of energy consumption. Hence, the optimization algorithm has low run-time complexity, enabling quick exploration of large design spaces.
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| 62. |
- Jorstad, S.G., et al.
(författare)
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The Event Horizon Telescope Image of the Quasar NRAO 530
- 2023
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Ingår i: Astrophysical Journal. - : American Astronomical Society. - 1538-4357 .- 0004-637X. ; 943:2
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Tidskriftsartikel (refereegranskat)abstract
- We report on the observations of the quasar NRAO 530 with the Event Horizon Telescope (EHT) on 2017 April 5-7, when NRAO 530 was used as a calibrator for the EHT observations of Sagittarius A*. At z = 0.902, this is the most distant object imaged by the EHT so far. We reconstruct the first images of the source at 230 GHz, at an unprecedented angular resolution of similar to 20 mu as, both in total intensity and in linear polarization (LP). We do not detect source variability, allowing us to represent the whole data set with static images. The images reveal a bright feature located on the southern end of the jet, which we associate with the core. The feature is linearly polarized, with a fractional polarization of similar to 5%-8%, and it has a substructure consisting of two components. Their observed brightness temperature suggests that the energy density of the jet is dominated by the magnetic field. The jet extends over 60 mu as along a position angle similar to -28 degrees. It includes two features with orthogonal directions of polarization (electric vector position angle), parallel and perpendicular to the jet axis, consistent with a helical structure of the magnetic field in the jet. The outermost feature has a particularly high degree of LP, suggestive of a nearly uniform magnetic field. Future EHT observations will probe the variability of the jet structure on microarcsecond scales, while simultaneous multiwavelength monitoring will provide insight into the high-energy emission origin.
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| 63. |
- Li, Shuo, et al.
(författare)
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A code generation method for system-level synthesis on ASIC, FPGA and manycore CGRA
- 2013
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Ingår i: MES '13 Proceedings of the First International Workshop on Many-core Embedded Systems. - New York, NY, USA : ACM. - 9781450320634 ; , s. 25-32
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Konferensbidrag (refereegranskat)abstract
- This paper presents a code generation method that translates an intermediate Register-Transfer Level (RTL) model of a system into its corresponding VHDL code for ASIC and FPGAs and MATLAB functions for manycores CGRAs. The intermediate representation consists of Function Implementation (FIMPs) and the glue logic. FIMPs are VHDL design units for the ASIC and FPGA implementation styles and MATLAB function templates for the CGRA implementation style, while the glue logic is a compact data structure storing Global Interconnect and Control (GLIC) information. The automatically generated implementation codes increase the resource usage by 1.5% on the average while reducing total design effort by two orders of magnitudes.
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| 64. |
- Li, Shuo, et al.
(författare)
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A code reuse method for many-core coarse-grained reconfigurable architecture function library development
- 2011
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Ingår i: 2011 International Symposium on Integrated Circuits, ISIC 2011. ; , s. 512-515
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Konferensbidrag (refereegranskat)abstract
- In this paper 1, a code reuse method is proposed to enhance the efficiency of the function library development of many core coarse-grained reconfigurable architecture. The method focuses on developing and using the precompiled ReCon-figurable Functions (RCFs) in the function library. By applying this method on the RCF development, functions are objectified like classes in any objective-oriented programming language. Using a function is to instantiate a selected RCF. Similar functions can be instantiated from the same RCF. Thus, the total number of RCFs to be compiled is reduced and the global programming efficiency is increased and the labor requirement for application development is reduced.
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| 65. |
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| 66. |
- Li, Shuo, et al.
(författare)
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Automatic test program generation framework for NoC-based MPSoC compiler validation
- 2011
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Ingår i: 2011 International Conference on Instrumentation, Measurement, Circuits and Systems (ICIMCS 2011), vol 1. - New York : Amer Soc Mechanical Engineers. - 9780791859902 ; , s. 99-103
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Konferensbidrag (refereegranskat)abstract
- In this paper, we propose a systematic method (a framework) for automatic test program generation for Network-on-Chip (NoC) based Multi-Processor System-on-Chip (MPSoC) compiler validation. This framework consists of three parts: specification reader, program generator and platform simulator. By applying this framework, specified test programs for compiler validation are automatically generated as well as their corresponding run time results. The validation productivity is enhanced and the expertise requirement is reduced. We also present an example tool called Automatic VESYLA Generator (AVG) implementing this framework. This tool is used in the Dynamic Reconfigurable Resource Array (DRRA) assembler development in our research group. The experiment shows that on a personal PC, AVG tool generates bug-free test programs more than 100 times faster than a human programmer.
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| 67. |
- Li, Shuo, et al.
(författare)
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Case Study : Constraint Programming in a System Level Synthesis Framework
- 2014
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Ingår i: PRINCIPLES AND PRACTICE OF CONSTRAINT PROGRAMMING, CP 2014. - Cham : Springer International Publishing. - 9783319104287 - 9783319104270 ; , s. 846-861
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Konferensbidrag (refereegranskat)abstract
- This article presents a case study of using a constraint programming solver in a system level synthesis framework called SYLVA. The solver is used to find the repetition vector of a synchronous data flow graph and serving as the design space exploration engine, which rapidly finds qualified system implementations by solving a constraint satisfaction optimization problem. Each system implementation is a combination of a number of function implementation instances and their cycle accurate execution schedules. The problem to be solved is automatically generated based on the user inputs: 1) a system model to be synthesized, 2) a library containing all the usable function implementations, 3) the performance/cost constraints, and 4) the optimization objectives. Use of constraints programming technique enabled a low cost development of design space exploration engine in addition to gaining ease of use.
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| 68. |
- Li, Shuo, et al.
(författare)
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Economic and environmental sustainability of maize-wheat rotation production when substituting mineral fertilizers with manure in the North China Plain
- 2020
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Ingår i: Journal of Cleaner Production. - : Elsevier. - 0959-6526 .- 1879-1786. ; 271
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Tidskriftsartikel (refereegranskat)abstract
- Substituting mineral fertilizers with manure has been promoted to enrich soil fertility and maintain field productivity in agricultural production systems. However, there is limited information regarding the effect of substituting mineral-N with manure on eco-efficiency (economic and environmental trade-offs) from a Life Cycle Assessment (LCA) perspective. This study investigated the eco-efficiency of maize-wheat rotation production under three fertilization strategies: mineral fertilizer NPK (CK), substituting 50% of mineral-N with solid manure (SM + NK), and substituting 50% of mineral-N with liquid manure (LM + NP) in the North China Plain. The economic profits were evaluated based on the prevailing market prices of inputs, outputs, and services. The potential environmental impacts were assessed by the LCA approach. The eco-efficiency was evaluated as the ratio of economic profit to individual environmental impact categories. The results from the economic analysis and the LCA showed that, compared with CK, the economic profit increased by 17.2% and 19.1%, while the environmental impacts at the endpoint level decreased by 24.6% and 37.9% under SM + NK and LM + NP, respectively. Additionally, the eco-efficiencies under SM + NK and LM + NP at the endpoint level were calculated to be 55.4% and 91.7%, respectively, higher than CK. Overall, the results suggested that substituting 50% of mineral-N with manure, especially liquid manure, had a great potential for sustainable maize-wheat rotation production in the North China Plain.
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| 69. |
- Li, Shuo, et al.
(författare)
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Economic, energy and environmental consequences of shifting from maize-wheat to forage rotation in the North China Plain
- 2021
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Ingår i: Journal of Cleaner Production. - : Elsevier BV. - 0959-6526 .- 1879-1786. ; 328
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Tidskriftsartikel (refereegranskat)abstract
- Intensive self-sufficient forage production is one of the dominant challenges for the boosting intensification of livestock production. However, there is limited information on the economic, energy and environmental consequences of converting conventional crop systems with intensive forage production systems. Based on 4-year field experiments, this work proposed a comprehensive assessment of the shift from maize-wheat (M-W) to forage production systems [silage maize-ryegrass (SM-R), sweet sorghum-ryegrass (SS-R), and sorghum-sudangrass hybrids-ryegrass (SH-R)] from economic, energy, and environmental perspectives in the northern part of the North China Plain (NCP). The results revealed that SH-R had the highest yields of dry shoot biomass and crude protein, followed by SS-R, SM-R, and M-W. Similar trends were also found for the net return, ratio of income to costs, net energy output, energy use efficiency, and energy productivity. Furthermore, the environmental assessment through a life cycle assessment suggested that compared with the M-W, the total potential environmental impacts for the product-based indicators were reduced by 50%, 55%, and 72% in SM-R, SS-R, and SH-R, respectively, even if crop protection was based on a prophylactic approach. Thus, shifting from maize-wheat to forage rotation systems, especially the sorghum-sudangrass hybrids-ryegrass system, may be promising for forage production in the northern part of the NCP. This work provides valuable insight into forage production system design and environmental change adaptation for improving food security and achieving green/circular economy.
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| 70. |
- Li, Shuo, et al.
(författare)
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Economic, energy and environmental performance assessment on wheat production under water-saving cultivation strategies
- 2022
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Ingår i: Energy. - : Elsevier BV. - 0360-5442 .- 1873-6785. ; , s. 125330-125330
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Tidskriftsartikel (refereegranskat)abstract
- Improvements in economic profit, energy-use efficiency and environmental friendliness are critical for the sustainability of wheat production. The present study was aimed at evaluating the suitability of wheat production shifting conventional flat planting (CFH) and supplemental irrigation (SIH) with water-saving cultivation strategies [straw mulching (SML) and plastic film mulching (PFL) with 50% less N fertilizer] from economic, energy, and environmental perspectives on the Loess Plateau of China. Results showed that the PFL exhibited ∼18.5% and 12.7% higher grain yields, and 74.0% and 59.9% higher economic profit over the CFH and SML, while reduced grain yields by 9.6% retative to the SIH. Meanwhile, the economic profit and the ratio of income to cost remained consistent between the PFL and SIH. The PFL had the highest net energy out, energy use efficiency and energy productivity, but had the lowest specific energy. Compared with the SIH, the total environmental emissions final score increased by 36.6% under SML, while decreased by 24.8% under PFL. Overall, the strategy of plastic film mulching with 50% less N fertilizer has great potential to cater to the demands of wheat production with environmental sustainability on the Loess Plateau of China.
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