With the prevalence of renewable distributed energy resources(DERs)such as photovoltaics(PVs),modern active distribution networks(ADNs)suffer from voltage deviation and power quality issues.However,traditional voltage...With the prevalence of renewable distributed energy resources(DERs)such as photovoltaics(PVs),modern active distribution networks(ADNs)suffer from voltage deviation and power quality issues.However,traditional voltage control methods often face a trade-off between efficiency and effectiveness,and rarely ensure robust voltage safety under typical state perturbations in practical distribution grids.In this paper,a robust model-free voltage regulation approach is proposed which simultaneously takes security and robustness into account.In this context,the voltage control problem is formulated as a constrained Markov decision process(CMDP).A safety-augmented multiagent deep deterministic policy gradient(MADDPG)algorithm is the trained to enable real-time collaborative optimization of ADNs,aiming to maintain nodal voltages within safe operational limits while minimizing total line losses.Moreover,a robust regulation loss is introduced to ensure reliable performance under various state perturbations in practical voltage controls.The proposed regulation algorithm effectively balance efficiency,safety,and robustness,and also demonstrates potential for generalizing these characteristics to other applications.Numerical studies vali-date the robustness of the proposed method under varying state perturbations on the IEEE test cases and the optimal integrated control performance when compared to other benchmarks.展开更多
目的:探究血清氯离子浓度对危重症和临床病情稳定的肝硬化失代偿期患者的预后价值。方法:回顾性纳入2017年1月至2022年1月于兰州大学第一医院重症医学科(intensive care unit,ICU)和消化科就诊的肝硬化失代偿期患者。分为ICU组和消化科...目的:探究血清氯离子浓度对危重症和临床病情稳定的肝硬化失代偿期患者的预后价值。方法:回顾性纳入2017年1月至2022年1月于兰州大学第一医院重症医学科(intensive care unit,ICU)和消化科就诊的肝硬化失代偿期患者。分为ICU组和消化科组;ICU组终点事件是院内死亡,logistic回归分析血清氯化物水平与ICU死亡率之间的关系,采用受试者工作特征曲线,并计算曲线下面积(area under the curve,AUC)评估血氯水平对ICU死亡率的预测价值。对纳入的消化科患者随访,终点事件是患者全因死亡率,运用Cox回归分析和Kaplan-Meier分析,探讨血氯水平对于患者死亡率的预测价值。结果:ICU组中:血清氯离子与ICU院内死亡率明显相关(OR=0.934,95%CI=0.871~0.993,P=0.035),血氯预测ICU院内死亡率AUC值为0.687;消化科组:在Child-Pugh评分<10的亚组中,血清氯离子浓度与患者死亡率明显相关(HR=0.906,95%CI=0.822~0.997,P=0.043),低氯血症与更低的生存率相关。结论:低氯血症与肝硬化失代偿期患者的死亡率增加相关。展开更多
Dysregulation of neurotransmitter metabolism in the central nervous system contributes to mood disorders such as depression, anxiety, and post–traumatic stress disorder. Monoamines and amino acids are important types...Dysregulation of neurotransmitter metabolism in the central nervous system contributes to mood disorders such as depression, anxiety, and post–traumatic stress disorder. Monoamines and amino acids are important types of neurotransmitters. Our previous results have shown that disco-interacting protein 2 homolog A(Dip2a) knockout mice exhibit brain development disorders and abnormal amino acid metabolism in serum. This suggests that DIP2A is involved in the metabolism of amino acid–associated neurotransmitters. Therefore, we performed targeted neurotransmitter metabolomics analysis and found that Dip2a deficiency caused abnormal metabolism of tryptophan and thyroxine in the basolateral amygdala and medial prefrontal cortex. In addition, acute restraint stress induced a decrease in 5-hydroxytryptamine in the basolateral amygdala. Additionally, Dip2a was abundantly expressed in excitatory neurons of the basolateral amygdala, and deletion of Dip2a in these neurons resulted in hopelessness-like behavior in the tail suspension test. Altogether, these findings demonstrate that DIP2A in the basolateral amygdala may be involved in the regulation of stress susceptibility. This provides critical evidence implicating a role of DIP2A in affective disorders.展开更多
基金supported in part by the National Natural Science Foundation of China(No.52177109)Key R&D Program of Hubei Province,China(No.2020BAB109).
文摘With the prevalence of renewable distributed energy resources(DERs)such as photovoltaics(PVs),modern active distribution networks(ADNs)suffer from voltage deviation and power quality issues.However,traditional voltage control methods often face a trade-off between efficiency and effectiveness,and rarely ensure robust voltage safety under typical state perturbations in practical distribution grids.In this paper,a robust model-free voltage regulation approach is proposed which simultaneously takes security and robustness into account.In this context,the voltage control problem is formulated as a constrained Markov decision process(CMDP).A safety-augmented multiagent deep deterministic policy gradient(MADDPG)algorithm is the trained to enable real-time collaborative optimization of ADNs,aiming to maintain nodal voltages within safe operational limits while minimizing total line losses.Moreover,a robust regulation loss is introduced to ensure reliable performance under various state perturbations in practical voltage controls.The proposed regulation algorithm effectively balance efficiency,safety,and robustness,and also demonstrates potential for generalizing these characteristics to other applications.Numerical studies vali-date the robustness of the proposed method under varying state perturbations on the IEEE test cases and the optimal integrated control performance when compared to other benchmarks.
文摘目的:探究血清氯离子浓度对危重症和临床病情稳定的肝硬化失代偿期患者的预后价值。方法:回顾性纳入2017年1月至2022年1月于兰州大学第一医院重症医学科(intensive care unit,ICU)和消化科就诊的肝硬化失代偿期患者。分为ICU组和消化科组;ICU组终点事件是院内死亡,logistic回归分析血清氯化物水平与ICU死亡率之间的关系,采用受试者工作特征曲线,并计算曲线下面积(area under the curve,AUC)评估血氯水平对ICU死亡率的预测价值。对纳入的消化科患者随访,终点事件是患者全因死亡率,运用Cox回归分析和Kaplan-Meier分析,探讨血氯水平对于患者死亡率的预测价值。结果:ICU组中:血清氯离子与ICU院内死亡率明显相关(OR=0.934,95%CI=0.871~0.993,P=0.035),血氯预测ICU院内死亡率AUC值为0.687;消化科组:在Child-Pugh评分<10的亚组中,血清氯离子浓度与患者死亡率明显相关(HR=0.906,95%CI=0.822~0.997,P=0.043),低氯血症与更低的生存率相关。结论:低氯血症与肝硬化失代偿期患者的死亡率增加相关。
基金supported by the STI 2030—Major Projects 2021ZD0204000,No.2021ZD0204003 (to XZ)the National Natural Science Foundation of China,Nos.32170973 (to XZ),32071018 (to ZH)。
文摘Dysregulation of neurotransmitter metabolism in the central nervous system contributes to mood disorders such as depression, anxiety, and post–traumatic stress disorder. Monoamines and amino acids are important types of neurotransmitters. Our previous results have shown that disco-interacting protein 2 homolog A(Dip2a) knockout mice exhibit brain development disorders and abnormal amino acid metabolism in serum. This suggests that DIP2A is involved in the metabolism of amino acid–associated neurotransmitters. Therefore, we performed targeted neurotransmitter metabolomics analysis and found that Dip2a deficiency caused abnormal metabolism of tryptophan and thyroxine in the basolateral amygdala and medial prefrontal cortex. In addition, acute restraint stress induced a decrease in 5-hydroxytryptamine in the basolateral amygdala. Additionally, Dip2a was abundantly expressed in excitatory neurons of the basolateral amygdala, and deletion of Dip2a in these neurons resulted in hopelessness-like behavior in the tail suspension test. Altogether, these findings demonstrate that DIP2A in the basolateral amygdala may be involved in the regulation of stress susceptibility. This provides critical evidence implicating a role of DIP2A in affective disorders.
