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Optimal coordinated voltage control of power systems

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j.urnal of Zhej.ang University-Science A(Applied Physics & Engineering) 2006年第2期7卷 257-262页

作者：李艳君 hill david j.吴铁军 Institute of Intelligent Systems and Decision Making Zhejiang University Hangzhou 310027 China Department of Electronic Engineering City University of Hong Kong Hong Kong China

An immune algorithm solution is proposed in this paper to deal with the problem of optimal coordination of local physically based controllers in order to preserve or retain mid and long term voltage stability. This problem is in fact a global coordination control problem which involves not only sequencing and timing different control devices but also tuning the parameters of controllers. A multi-stage coordinated control scheme is presented, aiming at retaining good voltage levels with minimal control efforts and costs after severe disturbances in power systems. A self-pattem-recognized vaccination procedure is developed to transfer effective heuristic information into the new generation of solution candidates to speed up the convergence of the search procedure to global optima. An example of four bus power system case study is investigated to show the effectiveness and efficiency of the proposed algorithm, compared with several existing approaches such as differential dynamic programming and tree-search.

关键词： Power systems Voltage control Immune algorithm Global optimization

含大量可再生能源未来电网的建模及控制（英文）

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南方电网技术 2017年第10期11卷 87-95页

作者：郑宇 david j.hill 刘涛南方电网科学研究院广州510663 香港大学电气电子工程学院

在需求侧采用更多的可控资源有望成为解决未来含大量可再生能源并网问题的可行策略。随着接入各级电网的负荷侧可控资源越来越多,负荷侧控制和输配电系统融合将成为未来电网控制模式的两大变化趋势。分布式可控资源和新能源的建模方法... 详细信息

在需求侧采用更多的可控资源有望成为解决未来含大量可再生能源并网问题的可行策略。随着接入各级电网的负荷侧可控资源越来越多,负荷侧控制和输配电系统融合将成为未来电网控制模式的两大变化趋势。分布式可控资源和新能源的建模方法和控制方式已经成为重大课题,需要开发出新的数学模型和协调控制方法。同时,为应对未来的变化,有必要确立一种经济性强、鲁棒性好的新的网络结构和控制策略。本文对上述研究思路进行综述,旨在确立双向潮流输电系统的控制架构,以应对需求侧和储能大量接入系统带来的挑战。提出了层级控制模式,考虑每个元件的特性,将它们表示为颗粒度图中的一个节点或支路。建模时将低压系统的整体特性提取出来以节点形式反映在高压系统中,可以在同一个协调模型中同时考虑输电系统、次级输电系统和配电系统,获取"纵深式"的建模结果。最后综述了精细粒度控制、频率控制、电压控制等具备类似控制结构的相关研究课题。

关键词：未来电网负荷侧控制精细粒度控制频率控制电压控制

Advances in Stability Theory for Complex Systems and Networks

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Integrated Single-cell Multiomic Analysis of HIV Latency Reversal Reveals Novel Regulators of Viral Reactivation

第二十七届中国控制会议

作者： hill david j. Research School of Information Sciences and Engineering Australian National University

ISBN: (纸本)9787811243901

Throughout natural and engineered systems,questions about stability always *** a power network avoid blackouts?Will the Internet avoid traffic congestion?Will a species population survive?Engineered systems now have features comparable to living systems,namely massive scale,high degrees of nonlinearity,uncertainty and *** systems are summarized as being *** important class of such systems has a well-defined network structure where large numbers of nodes,typically described by nonlinear dynamical systems,are connected by *** theory faces many challenges in providing tools to assess stability and instability for such complex *** this assessment must allow for layers of feedback control which have been implemented to regulate local and global *** paper will describe the advancement of stability theory to deal with complex systems with some emphasis on interconnected systems featuring feedback and network structures.

关键词： Stability Complex systems Networks

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Genomics, Proteomics & Bioinformatics 2024年第1期22卷 67-88页

作者： Manickam Ashokkumar Wenwen Mei j.ckson j.Peterson Yuriko Harigaya david M.Murdoch david M.Margolis Caleb Kornfein Alex Oesterling Zhicheng Guo Cynthia D.Rudin Yuchao j.ang Edward P.Browne Department of Medicine University of North Carolina at Chapel HillChapel HillNC 27599USA HIV Cure Center University of North Carolina at Chapel HillChapel HillNC 27599USA Department of Biostatistics University of North Carolina at Chapel HillChapel HillNC 27599USA Department of Microbiology and Immunology University of North Carolina at Chapel HillChapel HillNC 27599USA Department of Genetics University of North Carolina at Chapel HillChapel HillNC 27599USA Department of Medicine Duke UniversityDurhamNC 27708USA Department of Computer Science Duke UniversityDurhamNC 27708USA Department of Statistics Texas A&M UniversityCollege StationTX 77843USA Department of Biology Texas A&M UniversityCollege StationTX 77843USA Department of Biomedical Engineering Texas A&M UniversityCollege StationTX 77843USA

Despite the success of antiretroviral therapy,human immunodeficiency virus(HIV)cannot be cured because of a reservoir of latently infected cells that evades *** understand the mechanisms of HIV latency,we employed an integrated single-cell RNA sequencing(scRNA-seq)and single-cell assay for transposase-accessible chromatin with sequencing(scATAC-seq)approach to simultaneously profile the transcriptomic and epigenomic characteristics of~125,000 latently infected primary CD4^(+)T cells after reactivation using three different latency reversing *** expressed genes and differentially accessible motifs were used to examine transcriptional pathways and transcription factor(TF)activities across the cell *** identified cellular transcripts and TFs whose expression/activity was correlated with viral reactivation and demonstrated that a machine learning model trained on these data was 75%-79%accurate at predicting viral ***,we validated the role of two candidate HIV-regulating factors,FOXP1 and GATA3,in viral *** data demonstrate the power of integrated multimodal single-cell analysis to uncover novel relationships between host cell factors and HIV latency.

关键词： HIV latency reversal Primary CD4þT cell Single-cell multiomics HIV-regulating factor Machine learning

A Multi-parametric Programming Based Analytic Method to Compute Consumer Offer Curve for Reserves

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j.urnal of Modern Power Systems and Clean Energy 2022年第2期10卷 542-546页

作者： Weiye Zheng david j.hill Wenchuan Wu the School of Electrical Power Engineering South China University of TechnologyGuangzhouChina the Department of Electrical and Electronic Engineering The University of Hong KongHong KongChina the Department of Electrical Engineering Tsinghua UniversityBeijingChina

Abstract-An analytic method is proposed to compute the price-reserve offer curve at the consumer level in hierarchical direct load *** convexification of the consumer reserve provision is examined,and the analytic expression of the optimal solution within each critical region is ***,based on multi-parametric programming,a combinatorial enumeration method in conj.nction with efficient reduction and pruning strategy is proposed to compute the optimal response of consumers in the whole price *** tests along with an application example in the bi-level aggregator pricing problem demonstrate the merit of this method.

关键词： Direct load control multi-parametric programming price-reserve offer curve analytic solution

Soybean aphid intrabiotype variability based on colonization of specific soybean genotypes

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Insect Science 2015年第6期22卷 785-792页

作者： Michelle Pawlowski Curtis B. hill david j. Voegtlin Glen L. Hartman Department of Crop Sciences National Soybean Research Center University of Illinois Urbana Illinois USA Center for EconomicEntomology Illinois Natural History Survey University of Illinois Champaign Illinois USA USDA Agricultural Research Service National Soybean Research Center University of Illinois Urbana Illinois USA

The soybean aphid, Aphis glycines Matsumura （Hemiptera： Aphididae）, is one of the most destructive insect pests on soybeans in the United States. One method for managing this pest is through host plant resistance. Since its arrival in 2000, 4 aphid biotypes have been identified that are able to overcome soybean aphid resistance （Rag） genes. A soybean aphid isolate collected from Moline, Illinois readily colonized soybean plants with the soybean aphid resistance gene Rag2, unlike biotypes 1 and 2, but similar to soybean aphid biotype 3. Two no-choice experiments compared the virulence of the Moline isolate with biotype 3. In both experiments, differences in aphid population counts were not significant （P 〉 0.05） on soybean genotypes LD08-12957a （Rag2） and LD11-5413a （Rag2）, but the aphid counts for the Moline isolate were significantly （P 〈 0.05） lower than the aphid counts for the biotype 3 isolate on the soybean genotypes Dowling （Rag1）, LD05-16611 （Rag1）, LD11-4576a （Rag1）, and P1567598B （raglb and rag3）. The Moline isolate was a variant of aphid biotype 3, which is the first report showing that soybean aphid isolates classified as the same biotype, based on virulence against specific Rag genes, can differ in aggressiveness or ability to colonize specific host genotypes.

关键词： Aphis glycines biotype biotype variant soybean soybean aphid resistance

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分时电价下电动汽车路径选择和充电导航策略

南方电网技术 2016年第8期10卷 61-66页

作者：李明邓友均杨洪明赖明勇董朝阳 david j.hill 湖南省电动交通与智能配网工程技术研究中心(长沙理工大学电气与信息工程学院) 长沙410004 南方电网科学研究院广州510080

电动汽车路径选择和充电导航优化有助于提高用户出行效率,缓解大规模无序充电对配电系统安全运行的影响。考虑路径选择、电池容量及充放电状态互斥约束,构建了在分时电价机制下用户出行时间最优和充电成本最优两种不同决策目标下的电动... 详细信息

电动汽车路径选择和充电导航优化有助于提高用户出行效率,缓解大规模无序充电对配电系统安全运行的影响。考虑路径选择、电池容量及充放电状态互斥约束,构建了在分时电价机制下用户出行时间最优和充电成本最优两种不同决策目标下的电动汽车路径选择和充电导航优化模型。以某市中心20 km×20 km区域内包含4座快速充电站的交通网络及其所属配电系统为例进行数值仿真,分析了不同决策目标对用户出行路径以及电动汽车充放电对配电系统的影响,验证了所提模型和方法的可行性和有效性。

关键词：分时电价电动汽车路径选择充电导航

Semi-transparent,flexible,and electrically conductive silicon mesh by capillarity-driven welding of vapor-liquid-solid-grown nanowires over large areas

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Nano Research 2020年第5期13卷 1465-1471页

作者： Thomas A.Celano Seokhyoung Kim david j.hill j.mes F.Cahoon Department of Chemistry University of North Carolina at Chapel HillChapel HillNC 27599-3290USA

Bottom-up synthesis of semiconductor nanowires(NWs)by the vapor-liquid-solid(VLS)mechanism has enabled diverse technological applications for these *** metallic NWs,however,it has been challenging to form large-area interconnected NW ***,we generate centimeter-scale meshes of mechanically and electrically interconnected Si NWs by sequentially growing,collapsing,and j.ining the NWs using a capillarity-driven welding *** fabricate meshes from VLS-grown NWs ranging in diameter from 20 to 100 nm and find that the meshes are three-dimensional with a thickness ranging from^1 to^10 microns depending on the NW *** extinction measurements reveal that the networks are semi-transparent with a color that depends on the absorption and scattering characteristics of individual ***,active voltage contrast imaging of both centimeter-and micron-scale meshes reveals widespread electrical *** a sacrificial layer,we demonstrate that the mesh can be liberated from the growth substrate,yielding a highly flexible and transparent *** transport measurements both on the growth substrate and on liberated,flexible films reveal electrical conduction across a centimeter scale with a sheet resistance of^160-180 kΩ/square that does not change significantly upon *** the ability to encode complex functionality in semiconductor NWs through the VLS process,we believe these meshes of networked NWs could find application as neuromorphic memory,electrode scaffolds,and bioelectronic interfaces.

关键词： semiconductor nanowire conductive network flexible electronics welding thermal annealing active-voltage contrast

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细胞生长因子

世界科学 1990年第3期 21-23页

作者： david j.hill ,陈家华

导言正常组织生长与细胞增殖、体积增大、迁移、分化和老化等及各个过程间复杂的相互作用有关,同时受时间和解剖的严密制约。虽然诸如生长激素和甲状腺素等典型内分泌类激素,能影响组织总的生长和速率,但它们并非是组织生长时细胞间的... 详细信息

导言正常组织生长与细胞增殖、体积增大、迁移、分化和老化等及各个过程间复杂的相互作用有关,同时受时间和解剖的严密制约。虽然诸如生长激素和甲状腺素等典型内分泌类激素,能影响组织总的生长和速率,但它们并非是组织生长时细胞间的基本信号。当胚胎或胎儿迅速发育时,肽生长因子与组织诱导、干细胞克隆生长、器官发生相关联。并且是卵巢周期、睾丸功能、长骨生长、创伤愈合、人类生殖等重要因素。理化特性和解剖定位肽生长因子主要特征如表所述。它是分子量小于30000的典型蛋白质。如同经典的内分泌激素,肽生长因子以近程分泌和自身分泌激素形式,在组织周围合

关键词：成纤维细胞生长因子 TGF EGF PDGF 趋化剂血小板中胚层纤维细胞生长调节素 IGFs