The delimitation of urban development boundaries plays an important role in optimizing the nation land space.“Double evaluation”is one of the important means to study and predict the scale of new construction land i...The delimitation of urban development boundaries plays an important role in optimizing the nation land space.“Double evaluation”is one of the important means to study and predict the scale of new construction land in the future and to determine the spatial distribution of urban construction land.This study combines the“double evaluation”with the FLUS(Future Land-Use Simulation)model to study the delimitation of the urban development boundary of Yichang.The results show that:(1)the“double evaluation”method comprehensively considers the carrying capacity of the resource environmental bear and the suitability of urban development;(2)the FLUS model can better couple the“double evaluation”method for Land Use/Land Cover(LULC)suitability evaluation,Land Use/land Cover Change(LUCC)simulation and urban development boundary delineation,and the overall accuracy of the simulation reaches 96%;(3)according to the requirements of relevant national policies,this study divides the urban development boundary of the study area into concentrated construction areas,elastic development areas and special purpose areas.This function-based division can meet the requirements of urban flexible development,ecological protection and urban safety.This research combines the FLUS model,which is widely used in the simulation of LUCC,with the double evaluation method used in China’s new round of land and space planning to obtain the result of the urban development boundary.This result is consistent with the existing plan of the study area.展开更多
Challenges still remain in carrying out assembly modeling efficiently in virtual assembly （VA） fields. One of the root causes is the apparent weakness in effective description of assembly knowledge and information. ...Challenges still remain in carrying out assembly modeling efficiently in virtual assembly （VA） fields. One of the root causes is the apparent weakness in effective description of assembly knowledge and information. The assembly modeling, disassembly modeling, assembly interference inspection, assembly sequence planning and optimization, and assembly simulation display for key techniques is studied theoretically in this paper. An example of product assembly modeling is provided to illustrate the effectiveness of the proposed approach. On the basis of re- search, using assembly simulation techniques and multimedia techniques to finish structure design in linkage design of a large size wind-drive generator. The application of the modeling method has shortened the lead time dramatically.展开更多
This paper proposes to use the power system simulation software CYME to plan, model and simulate for an actual distribution network for improving the reliability and efficiency, enhancing the efficiency and capacity, ...This paper proposes to use the power system simulation software CYME to plan, model and simulate for an actual distribution network for improving the reliability and efficiency, enhancing the efficiency and capacity, simulating the abnormal condition of distribution network, and presenting operation program of safe, reliable and having simulation record statements. The modeling simulation results show that the software module has lots of advantages including high accuracy, ideal reliability, powerful practicality in simulation and analysis of distribution network, it only need to create once model, the model can sufficiently satisfy multifarious types of simulation analysis required for the distribution network planning.展开更多
We present an efficient and risk-informed closed-loop field development (CLFD) workflow for recurrently revising the field development plan (FDP) using the accrued information. To make the process practical, we integr...We present an efficient and risk-informed closed-loop field development (CLFD) workflow for recurrently revising the field development plan (FDP) using the accrued information. To make the process practical, we integrated multiple concepts of machine learning, an intelligent selection process to discard the worst FDP options and a growing set of representative reservoir models. These concepts were combined and used with a cluster-based learning and evolution optimizer to efficiently explore the search space of decision variables. Unlike previous studies, we also added the execution time of the CLFD workflow and worked with more realistic timelines to confirm the utility of a CLFD workflow. To appreciate the importance of data assimilation and new well-logs in a CLFD workflow, we carried out researches at rigorous conditions without a reduction in uncertainty attributes. The proposed CLFD workflow was implemented on a benchmark analogous to a giant field with extensively time-consuming simulation models. The results underscore that an ensemble with as few as 100 scenarios was sufficient to gauge the geological uncertainty, despite working with a giant field with highly heterogeneous characteristics. It is demonstrated that the CLFD workflow can improve the efficiency by over 85% compared to the previously validated workflow. Finally, we present some acute insights and problems related to data assimilation for the practical application of a CLFD workflow.展开更多
In this paper, the principle and methods of system engineering are applied to studying the problem of educational long-term development planning. a complete mathematical-simulated model setup is adopted to describe th...In this paper, the principle and methods of system engineering are applied to studying the problem of educational long-term development planning. a complete mathematical-simulated model setup is adopted to describe the internal regularity between educational system and social economic macrosystem. and then. a set of effective methods are put forward to carry out educational planning. This model has been actually appliedcation in the project of educational planning research in Chongqing region,展开更多
Pilot is one of the most important factors to ensure aviation safety. The article focuses on the Pilots Development Planning (PDP) problem. It is different from other countries that pilots are developed by airways the...Pilot is one of the most important factors to ensure aviation safety. The article focuses on the Pilots Development Planning (PDP) problem. It is different from other countries that pilots are developed by airways themselves in China. Promotion of every pilot needs specified quantity of flight experience hours which are accumulated in daily flights. In the same time, the promotion routes of pilots are diversified. So keys of PDP problem are to estimate the number of pilots who have promotion qualification in different planning period and to optimize their promotion and transfer in all routes. After analyzing characteristics of pilot training, a PDP road map is drawn which shows the typical process for pilots’ promotion and transfer. An optimization model which has promotion qualification constraints is built to solve PDP problem. According to different pilot development patterns, the method is proved to be effectively by a case study. The research has practical significance for Chinese airways.展开更多
A strategy for the integration of production planning and scheduling in refineries is proposed. This strategy relies on rolling horizon strategy and a two-level decomposition strategy. This strategy involves an upper ...A strategy for the integration of production planning and scheduling in refineries is proposed. This strategy relies on rolling horizon strategy and a two-level decomposition strategy. This strategy involves an upper level multiperiod mixed integer linear programming （MILP） model and a lower level simulation system, which is extended from our previous framework for short-term scheduling problems [Luo, C.E, Rong, G, ＂Hierarchical apthis extended framework is to reduce the number of variables and the size of the optimization model and, to quickly find the optimal solution for the integrated planning/scheduling problem in refineries. Uncertainties are also considered in this article. An integrated robust optimization approach is introduced to cope with uncertain parameters with both continuous and discrete probability distribution.展开更多
为了确定通用性园艺作物发育期和采收期模拟模型的最优模拟路径,该研究获取了9 a 58茬分期播种试验观测数据,分别以黄瓜(‘津优35’和‘津盛206’)、番茄(‘瑞粉882’和‘普罗旺斯’)、芹菜(‘尤文图斯’)、菠菜(‘大叶’)、香芹(‘四季...为了确定通用性园艺作物发育期和采收期模拟模型的最优模拟路径,该研究获取了9 a 58茬分期播种试验观测数据,分别以黄瓜(‘津优35’和‘津盛206’)、番茄(‘瑞粉882’和‘普罗旺斯’)、芹菜(‘尤文图斯’)、菠菜(‘大叶’)、香芹(‘四季’)、郁金香(‘粉色印象’、‘白日梦’、‘艾斯米’和‘夜皇后’)、茶叶(‘龙井’)为供试材料,依据作物生长发育与关键气象因子(辐射和温度)的关系,基于4类建模方法(温差法、积温法、生理发育时间法和辐热积法)构建了园艺作物发育期和采收期模拟模型,确定了模型关键参数,并以4种方式(平均值、最值均值、中值和逐步回归)集成模拟结果,最终确定模型最优模拟路径。结果表明:1)不同时间尺度发育期和采收期模拟模型的均方根误差(root mean square error,RMSE)为4.85~17.01 d,归一化均方根误差(normalized root mean square error,NRMSE)为10.65%~16.31%;不同作物发育期和采收期模拟模型的RMSE为0.50~17.08 d,NRMSE为4.33%~20.24%,郁金香发育期模拟模型最优,黄瓜采收期模拟模型最优;不同模拟方法发育期和采收期模拟模型的RMSE为0.08~24.37 d,NRMSE为0.18%~54.81%。2)通过比较不同模拟方法的模拟精度,得出逐时优于逐日时间尺度,集成方法优于单一方法模拟,正弦优于线性温度响应模式,叶温优于气温温度形式,温度响应模拟需要考虑下限和上限温度。3)最优模拟路径为先选择逐时尺度、考虑生物学下限和上限温度的正弦温度响应模式和叶温温度形式构建模型,再选择集成法优化发育期(中值集成)和采收期(逐步回归集成)模型。研究结果为指导园艺作物智慧生产管理和高效利用农业资源方面提供理论基础和技术支撑。展开更多
基金Natural Science Foundation of Hubei Province(No.2021CFB402)Key Laboratory of National Geographic Census and Monitoring,Ministry of Natural Resources(No.2020NGCMZD03)。
文摘The delimitation of urban development boundaries plays an important role in optimizing the nation land space.“Double evaluation”is one of the important means to study and predict the scale of new construction land in the future and to determine the spatial distribution of urban construction land.This study combines the“double evaluation”with the FLUS(Future Land-Use Simulation)model to study the delimitation of the urban development boundary of Yichang.The results show that:(1)the“double evaluation”method comprehensively considers the carrying capacity of the resource environmental bear and the suitability of urban development;(2)the FLUS model can better couple the“double evaluation”method for Land Use/Land Cover(LULC)suitability evaluation,Land Use/land Cover Change(LUCC)simulation and urban development boundary delineation,and the overall accuracy of the simulation reaches 96%;(3)according to the requirements of relevant national policies,this study divides the urban development boundary of the study area into concentrated construction areas,elastic development areas and special purpose areas.This function-based division can meet the requirements of urban flexible development,ecological protection and urban safety.This research combines the FLUS model,which is widely used in the simulation of LUCC,with the double evaluation method used in China’s new round of land and space planning to obtain the result of the urban development boundary.This result is consistent with the existing plan of the study area.
基金supported by the Foundation of Jiangsu Province for Talented Personnel and the Self-determined Research Program of Jiangnan University
文摘Challenges still remain in carrying out assembly modeling efficiently in virtual assembly （VA） fields. One of the root causes is the apparent weakness in effective description of assembly knowledge and information. The assembly modeling, disassembly modeling, assembly interference inspection, assembly sequence planning and optimization, and assembly simulation display for key techniques is studied theoretically in this paper. An example of product assembly modeling is provided to illustrate the effectiveness of the proposed approach. On the basis of re- search, using assembly simulation techniques and multimedia techniques to finish structure design in linkage design of a large size wind-drive generator. The application of the modeling method has shortened the lead time dramatically.
文摘This paper proposes to use the power system simulation software CYME to plan, model and simulate for an actual distribution network for improving the reliability and efficiency, enhancing the efficiency and capacity, simulating the abnormal condition of distribution network, and presenting operation program of safe, reliable and having simulation record statements. The modeling simulation results show that the software module has lots of advantages including high accuracy, ideal reliability, powerful practicality in simulation and analysis of distribution network, it only need to create once model, the model can sufficiently satisfy multifarious types of simulation analysis required for the distribution network planning.
文摘We present an efficient and risk-informed closed-loop field development (CLFD) workflow for recurrently revising the field development plan (FDP) using the accrued information. To make the process practical, we integrated multiple concepts of machine learning, an intelligent selection process to discard the worst FDP options and a growing set of representative reservoir models. These concepts were combined and used with a cluster-based learning and evolution optimizer to efficiently explore the search space of decision variables. Unlike previous studies, we also added the execution time of the CLFD workflow and worked with more realistic timelines to confirm the utility of a CLFD workflow. To appreciate the importance of data assimilation and new well-logs in a CLFD workflow, we carried out researches at rigorous conditions without a reduction in uncertainty attributes. The proposed CLFD workflow was implemented on a benchmark analogous to a giant field with extensively time-consuming simulation models. The results underscore that an ensemble with as few as 100 scenarios was sufficient to gauge the geological uncertainty, despite working with a giant field with highly heterogeneous characteristics. It is demonstrated that the CLFD workflow can improve the efficiency by over 85% compared to the previously validated workflow. Finally, we present some acute insights and problems related to data assimilation for the practical application of a CLFD workflow.
文摘In this paper, the principle and methods of system engineering are applied to studying the problem of educational long-term development planning. a complete mathematical-simulated model setup is adopted to describe the internal regularity between educational system and social economic macrosystem. and then. a set of effective methods are put forward to carry out educational planning. This model has been actually appliedcation in the project of educational planning research in Chongqing region,
文摘Pilot is one of the most important factors to ensure aviation safety. The article focuses on the Pilots Development Planning (PDP) problem. It is different from other countries that pilots are developed by airways themselves in China. Promotion of every pilot needs specified quantity of flight experience hours which are accumulated in daily flights. In the same time, the promotion routes of pilots are diversified. So keys of PDP problem are to estimate the number of pilots who have promotion qualification in different planning period and to optimize their promotion and transfer in all routes. After analyzing characteristics of pilot training, a PDP road map is drawn which shows the typical process for pilots’ promotion and transfer. An optimization model which has promotion qualification constraints is built to solve PDP problem. According to different pilot development patterns, the method is proved to be effectively by a case study. The research has practical significance for Chinese airways.
基金Supported by the National Natural Science Foundation of China （60421002） and the National High Technology R＆D Program of China （2007AA04Z191）.
文摘A strategy for the integration of production planning and scheduling in refineries is proposed. This strategy relies on rolling horizon strategy and a two-level decomposition strategy. This strategy involves an upper level multiperiod mixed integer linear programming （MILP） model and a lower level simulation system, which is extended from our previous framework for short-term scheduling problems [Luo, C.E, Rong, G, ＂Hierarchical apthis extended framework is to reduce the number of variables and the size of the optimization model and, to quickly find the optimal solution for the integrated planning/scheduling problem in refineries. Uncertainties are also considered in this article. An integrated robust optimization approach is introduced to cope with uncertain parameters with both continuous and discrete probability distribution.
文摘为了确定通用性园艺作物发育期和采收期模拟模型的最优模拟路径,该研究获取了9 a 58茬分期播种试验观测数据,分别以黄瓜(‘津优35’和‘津盛206’)、番茄(‘瑞粉882’和‘普罗旺斯’)、芹菜(‘尤文图斯’)、菠菜(‘大叶’)、香芹(‘四季’)、郁金香(‘粉色印象’、‘白日梦’、‘艾斯米’和‘夜皇后’)、茶叶(‘龙井’)为供试材料,依据作物生长发育与关键气象因子(辐射和温度)的关系,基于4类建模方法(温差法、积温法、生理发育时间法和辐热积法)构建了园艺作物发育期和采收期模拟模型,确定了模型关键参数,并以4种方式(平均值、最值均值、中值和逐步回归)集成模拟结果,最终确定模型最优模拟路径。结果表明:1)不同时间尺度发育期和采收期模拟模型的均方根误差(root mean square error,RMSE)为4.85~17.01 d,归一化均方根误差(normalized root mean square error,NRMSE)为10.65%~16.31%;不同作物发育期和采收期模拟模型的RMSE为0.50~17.08 d,NRMSE为4.33%~20.24%,郁金香发育期模拟模型最优,黄瓜采收期模拟模型最优;不同模拟方法发育期和采收期模拟模型的RMSE为0.08~24.37 d,NRMSE为0.18%~54.81%。2)通过比较不同模拟方法的模拟精度,得出逐时优于逐日时间尺度,集成方法优于单一方法模拟,正弦优于线性温度响应模式,叶温优于气温温度形式,温度响应模拟需要考虑下限和上限温度。3)最优模拟路径为先选择逐时尺度、考虑生物学下限和上限温度的正弦温度响应模式和叶温温度形式构建模型,再选择集成法优化发育期(中值集成)和采收期(逐步回归集成)模型。研究结果为指导园艺作物智慧生产管理和高效利用农业资源方面提供理论基础和技术支撑。
基金supported by the Specialized Research Fund for the Doctoral Program of the Ministry of Education,China(No20090006110024)the Fundamental Research Funds for Central Universities(NoFRF-BR-09-020B)
