The stock of Bigeye tuna(Thunnus obesus) in the Indian Ocean supports an important international fishery and is considered to be fully exploited. The responsible management agency, the Indian Ocean Tuna Commission(IOT...The stock of Bigeye tuna(Thunnus obesus) in the Indian Ocean supports an important international fishery and is considered to be fully exploited. The responsible management agency, the Indian Ocean Tuna Commission(IOTC), does not have an explicit management decision-making framework in place to prevent over-fishing. In this study, we evaluated three harvest control rules, i) constant fishing mortality(CF), from 0.2 to 0.6, ii) constant catch(CC), from 60000 to 140000 t, and iii) constant escapement(CE), from 0.3 to 0.7. The population dynamics simulated by the operating model was based on the most recent stock assessment using Stock Synthesis version Ⅲ(SS3). Three simulation scenarios(low, medium and high productivity) were designed to cover possible uncertainty in the stock assessment and biological parameters. Performances of three harvest control rules were compared on the basis of three management objectives(over 3, 10 and 25 years): i) the probability of maintaining spawning stock biomass above a level that can sustain maximum sustainable yield(MSY) on average, ii) the probability of achieving average catches between 0.8 MSY and 1.0 MSY, and iii) inter-annual variability in catches. The constant escapement strategy(CE=0.5), constant fishing mortality strategy(F=0.4) and constant catch(CC=80000) were the most rational among the respective management scenarios. It is concluded that the short-term annual catch is suggested at 80000 t, and the potential total allowable catch for a stable yield could be set at 120000 t once the stock had recovered successfully. All the strategies considered in this study to achieve a ‘tolerable' balance between resource conservation and utilization have been based around the management objectives of the IOTC.展开更多
To improve the ability and precisions of the fuzzy control,this thesis points out the adjusted fuzzy control method,realizes the precision of the fuzzy quantity, and reduces the number of the fuzzy control rules,so th...To improve the ability and precisions of the fuzzy control,this thesis points out the adjusted fuzzy control method,realizes the precision of the fuzzy quantity, and reduces the number of the fuzzy control rules,so that it can predigest the process of disigns and realize the methods without influencing the idiocratic control,which are on the base of the domain flexing.展开更多
The application of conventional flood operation regulation is restricted due to insufficient description of flood control rules for the Pubugou Reservoir in southern China. Based on the requirements of different flood...The application of conventional flood operation regulation is restricted due to insufficient description of flood control rules for the Pubugou Reservoir in southern China. Based on the requirements of different flood control objects, this paper proposes to optimize flood control rules with punishment mechanism by defining different parameters of flood control rules in response to flood inflow forecast and reservoir water level. A genetic algorithm is adopted for solving parameter optimization problem. The failure risk and overflow volume of the downstream insufficient flood control capacity are assessed through the reservoir operation policies. The results show that an optimised regulation can provide better performance than the current flood control rules.展开更多
Hall sensor is widely used for estimating rotor phase of permanent magnet synchronous motor(PMSM). And rotor position is an essential parameter of PMSM control algorithm, hence it is very dangerous if Hall senor fault...Hall sensor is widely used for estimating rotor phase of permanent magnet synchronous motor(PMSM). And rotor position is an essential parameter of PMSM control algorithm, hence it is very dangerous if Hall senor faults occur. But there is scarcely any research focusing on fault diagnosis and fault-tolerant control of Hall sensor used in PMSM. From this standpoint, the Hall sensor faults which may occur during the PMSM operating are theoretically analyzed. According to the analysis results, the fault diagnosis algorithm of Hall sensor, which is based on three rules, is proposed to classify the fault phenomena accurately. The rotor phase estimation algorithms, based on one or two Hall sensor(s), are initialized to engender the fault-tolerant control algorithm. The fault diagnosis algorithm can detect 60 Hall fault phenomena in total as well as all detections can be fulfilled in 1/138 rotor rotation period. The fault-tolerant control algorithm can achieve a smooth torque production which means the same control effect as normal control mode (with three Hall sensors). Finally, the PMSM bench test verifies the accuracy and rapidity of fault diagnosis and fault-tolerant control strategies. The fault diagnosis algorithm can detect all Hall sensor faults promptly and fault-tolerant control algorithm allows the PMSM to face failure conditions of one or two Hall sensor(s). In addition, the transitions between health-control and fault-tolerant control conditions are smooth without any additional noise and harshness. Proposed algorithms can deal with the Hall sensor faults of PMSM in real applications, and can be provided to realize the fault diagnosis and fault-tolerant control of PMSM.展开更多
On the tasis of study in the mathematical model of 3-dimensional ruled surface (RS),this paper introduces a new concept of distance paramcter (DP) and also puts forward that themethod of modeling a RS depends on not o...On the tasis of study in the mathematical model of 3-dimensional ruled surface (RS),this paper introduces a new concept of distance paramcter (DP) and also puts forward that themethod of modeling a RS depends on not only two boundary curves but also DP. According toabove theory, the formulas to calculate corresponding point coordinates to any kind of top and bot-tom profile of a workpiece and formulas to calcuate the maximum inclination angle of ruling linehave been obtained. Then a different top and bottom RS mathining method including profile withline-are combination as well as parametric curves has been achieved by 4-axes simultancous con-trol programming proposed.展开更多
Growing numbers of users and many access control policies which involve many different resource attributes in service-oriented environments bring various problems in protecting resource.This paper analyzes the relatio...Growing numbers of users and many access control policies which involve many different resource attributes in service-oriented environments bring various problems in protecting resource.This paper analyzes the relationships of resource attributes to user attributes in all policies, and propose a general attribute and rule based role-based access control(GAR-RBAC) model to meet the security needs. The model can dynamically assign users to roles via rules to meet the need of growing numbers of users. These rules use different attribute expression and permission as a part of authorization constraints, and are defined by analyzing relations of resource attributes to user attributes in many access policies that are defined by the enterprise. The model is a general access control model, and can support many access control policies, and also can be used to wider application for service. The paper also describes how to use the GAR-RBAC model in Web service environments.展开更多
质控品对疫苗质控和评价实验室检测结果的有效性和一致性十分重要。鉴于疫苗类制品及临床样本的特殊性,世界卫生组织(World Health Organization,WHO)和我国已发布了多个参比试剂和参考品用于实验室质控,以保证检测质量。近年来,国家实...质控品对疫苗质控和评价实验室检测结果的有效性和一致性十分重要。鉴于疫苗类制品及临床样本的特殊性,世界卫生组织(World Health Organization,WHO)和我国已发布了多个参比试剂和参考品用于实验室质控,以保证检测质量。近年来,国家实验室认可技术文件和国家技术标准等更新完善了实验室质控管理,包括质控品建立、应用和质控规则等方面的技术要求。《中国药典》四部(2025版)《生物活性测定方法设计、建立及验证指导原则》要求,生物活性测定方法需对质控品效价等进行持续监控。依据疫苗质控和评价实验室的特性,开展质控品及质控规则的针对性研究和应用,对提升我国疫苗质控和疫苗临床试验检测水平具有实际意义。本文总结归纳了国内外质控品相关技术指南及文献,以期为疫苗类制品质控和临床样本检测用质控品的建立与应用提供思路。展开更多
目的运用分析批长度Westgard-西格玛规则优化液相色谱-串联质谱(LC/MS-MS)法检测拉莫三嗪血药浓度项目的室内质量控制策略,指导检测方法质量改进。方法采用2024年国家卫生临床检验中心性能规范中的总允许误差(TEa)作为质量目标,基于202...目的运用分析批长度Westgard-西格玛规则优化液相色谱-串联质谱(LC/MS-MS)法检测拉莫三嗪血药浓度项目的室内质量控制策略,指导检测方法质量改进。方法采用2024年国家卫生临床检验中心性能规范中的总允许误差(TEa)作为质量目标,基于2024年上半年卫生部室间质评实验数据的偏倚值(Bias%)和实验室连续6个月(2023年10月至2024年3月)室内质控数据计算的变异系数(CV),计算3个水平质控的σ水平值,并运用分析批长度Westgard-西格玛规则设计室内质控策略。结果低、中、高水平质控累积CV分别为6.17%,5.00%和4.25%;Bias%分别为1.45%,2.82%和2.05%;TEa为20%;σ水平值分别为3.01,3.44和4.22,分析性能分别为临界、临界和良好。建议将1_(3s)/2 of 3_(2s)/R_(4s)/3_(1s)/6x(N=3,R=2)多规则和45个样品的批次量用于该实验室拉莫三嗪室内质控方案。质量目标指数(QGI)值低于0.8,表明精密度需要提高。结论分析批长度Westgard-西格玛规则可用于优化LC-MS/MS法检测拉莫三嗪血药浓度的质控策略。展开更多
基金supported by Shanghai Ocean University Graduate School (PhD Dissertation Grant)the National High-tech R&D Program of China (863 Program 2012AA 092303)+3 种基金Project of Shanghai Science and Technology Innovation (12231203900)Industrialization Program of National Development and Reform Commission (2159999)National Key Technologies Research, Development Program of China (2013BAD13B00)Shanghai Universities First-Class Disciplines Project (Fisheries A)
文摘The stock of Bigeye tuna(Thunnus obesus) in the Indian Ocean supports an important international fishery and is considered to be fully exploited. The responsible management agency, the Indian Ocean Tuna Commission(IOTC), does not have an explicit management decision-making framework in place to prevent over-fishing. In this study, we evaluated three harvest control rules, i) constant fishing mortality(CF), from 0.2 to 0.6, ii) constant catch(CC), from 60000 to 140000 t, and iii) constant escapement(CE), from 0.3 to 0.7. The population dynamics simulated by the operating model was based on the most recent stock assessment using Stock Synthesis version Ⅲ(SS3). Three simulation scenarios(low, medium and high productivity) were designed to cover possible uncertainty in the stock assessment and biological parameters. Performances of three harvest control rules were compared on the basis of three management objectives(over 3, 10 and 25 years): i) the probability of maintaining spawning stock biomass above a level that can sustain maximum sustainable yield(MSY) on average, ii) the probability of achieving average catches between 0.8 MSY and 1.0 MSY, and iii) inter-annual variability in catches. The constant escapement strategy(CE=0.5), constant fishing mortality strategy(F=0.4) and constant catch(CC=80000) were the most rational among the respective management scenarios. It is concluded that the short-term annual catch is suggested at 80000 t, and the potential total allowable catch for a stable yield could be set at 120000 t once the stock had recovered successfully. All the strategies considered in this study to achieve a ‘tolerable' balance between resource conservation and utilization have been based around the management objectives of the IOTC.
文摘To improve the ability and precisions of the fuzzy control,this thesis points out the adjusted fuzzy control method,realizes the precision of the fuzzy quantity, and reduces the number of the fuzzy control rules,so that it can predigest the process of disigns and realize the methods without influencing the idiocratic control,which are on the base of the domain flexing.
基金funded by the National Natural Science Foundations of China (Nos. 51179130 and 51190094)
文摘The application of conventional flood operation regulation is restricted due to insufficient description of flood control rules for the Pubugou Reservoir in southern China. Based on the requirements of different flood control objects, this paper proposes to optimize flood control rules with punishment mechanism by defining different parameters of flood control rules in response to flood inflow forecast and reservoir water level. A genetic algorithm is adopted for solving parameter optimization problem. The failure risk and overflow volume of the downstream insufficient flood control capacity are assessed through the reservoir operation policies. The results show that an optimised regulation can provide better performance than the current flood control rules.
基金supported by National Natural Science Foundation of China(Grant No. 51275264)National Hi-tech Research and Development Program of China(863 Program, Grant No. 2011AA11A269)
文摘Hall sensor is widely used for estimating rotor phase of permanent magnet synchronous motor(PMSM). And rotor position is an essential parameter of PMSM control algorithm, hence it is very dangerous if Hall senor faults occur. But there is scarcely any research focusing on fault diagnosis and fault-tolerant control of Hall sensor used in PMSM. From this standpoint, the Hall sensor faults which may occur during the PMSM operating are theoretically analyzed. According to the analysis results, the fault diagnosis algorithm of Hall sensor, which is based on three rules, is proposed to classify the fault phenomena accurately. The rotor phase estimation algorithms, based on one or two Hall sensor(s), are initialized to engender the fault-tolerant control algorithm. The fault diagnosis algorithm can detect 60 Hall fault phenomena in total as well as all detections can be fulfilled in 1/138 rotor rotation period. The fault-tolerant control algorithm can achieve a smooth torque production which means the same control effect as normal control mode (with three Hall sensors). Finally, the PMSM bench test verifies the accuracy and rapidity of fault diagnosis and fault-tolerant control strategies. The fault diagnosis algorithm can detect all Hall sensor faults promptly and fault-tolerant control algorithm allows the PMSM to face failure conditions of one or two Hall sensor(s). In addition, the transitions between health-control and fault-tolerant control conditions are smooth without any additional noise and harshness. Proposed algorithms can deal with the Hall sensor faults of PMSM in real applications, and can be provided to realize the fault diagnosis and fault-tolerant control of PMSM.
文摘On the tasis of study in the mathematical model of 3-dimensional ruled surface (RS),this paper introduces a new concept of distance paramcter (DP) and also puts forward that themethod of modeling a RS depends on not only two boundary curves but also DP. According toabove theory, the formulas to calculate corresponding point coordinates to any kind of top and bot-tom profile of a workpiece and formulas to calcuate the maximum inclination angle of ruling linehave been obtained. Then a different top and bottom RS mathining method including profile withline-are combination as well as parametric curves has been achieved by 4-axes simultancous con-trol programming proposed.
基金The National Natural Science Foundation of China(No60402019No60672068)
文摘Growing numbers of users and many access control policies which involve many different resource attributes in service-oriented environments bring various problems in protecting resource.This paper analyzes the relationships of resource attributes to user attributes in all policies, and propose a general attribute and rule based role-based access control(GAR-RBAC) model to meet the security needs. The model can dynamically assign users to roles via rules to meet the need of growing numbers of users. These rules use different attribute expression and permission as a part of authorization constraints, and are defined by analyzing relations of resource attributes to user attributes in many access policies that are defined by the enterprise. The model is a general access control model, and can support many access control policies, and also can be used to wider application for service. The paper also describes how to use the GAR-RBAC model in Web service environments.
文摘质控品对疫苗质控和评价实验室检测结果的有效性和一致性十分重要。鉴于疫苗类制品及临床样本的特殊性,世界卫生组织(World Health Organization,WHO)和我国已发布了多个参比试剂和参考品用于实验室质控,以保证检测质量。近年来,国家实验室认可技术文件和国家技术标准等更新完善了实验室质控管理,包括质控品建立、应用和质控规则等方面的技术要求。《中国药典》四部(2025版)《生物活性测定方法设计、建立及验证指导原则》要求,生物活性测定方法需对质控品效价等进行持续监控。依据疫苗质控和评价实验室的特性,开展质控品及质控规则的针对性研究和应用,对提升我国疫苗质控和疫苗临床试验检测水平具有实际意义。本文总结归纳了国内外质控品相关技术指南及文献,以期为疫苗类制品质控和临床样本检测用质控品的建立与应用提供思路。
文摘目的运用分析批长度Westgard-西格玛规则优化液相色谱-串联质谱(LC/MS-MS)法检测拉莫三嗪血药浓度项目的室内质量控制策略,指导检测方法质量改进。方法采用2024年国家卫生临床检验中心性能规范中的总允许误差(TEa)作为质量目标,基于2024年上半年卫生部室间质评实验数据的偏倚值(Bias%)和实验室连续6个月(2023年10月至2024年3月)室内质控数据计算的变异系数(CV),计算3个水平质控的σ水平值,并运用分析批长度Westgard-西格玛规则设计室内质控策略。结果低、中、高水平质控累积CV分别为6.17%,5.00%和4.25%;Bias%分别为1.45%,2.82%和2.05%;TEa为20%;σ水平值分别为3.01,3.44和4.22,分析性能分别为临界、临界和良好。建议将1_(3s)/2 of 3_(2s)/R_(4s)/3_(1s)/6x(N=3,R=2)多规则和45个样品的批次量用于该实验室拉莫三嗪室内质控方案。质量目标指数(QGI)值低于0.8,表明精密度需要提高。结论分析批长度Westgard-西格玛规则可用于优化LC-MS/MS法检测拉莫三嗪血药浓度的质控策略。
