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https://www.readbyqxmd.com/read/28541920/distributed-optimization-design-of-continuous-time-multiagent-systems-with-unknown-frequency-disturbances
#1
Xinghu Wang, Yiguang Hong, Peng Yi, Haibo Ji, Yu Kang
In this paper, a distributed optimization problem is studied for continuous-time multiagent systems with unknown-frequency disturbances. A distributed gradient-based control is proposed for the agents to achieve the optimal consensus with estimating unknown frequencies and rejecting the bounded disturbance in the semi-global sense. Based on convex optimization analysis and adaptive internal model approach, the exact optimization solution can be obtained for the multiagent system disturbed by exogenous disturbances with uncertain parameters...
May 24, 2017: IEEE Transactions on Cybernetics
https://www.readbyqxmd.com/read/28541918/consensus-of-heterogeneous-linear-multiagent-systems-with-communication-time-delays
#2
Xiang Xu, Lu Liu, Gang Feng
This paper studies the consensus problem of heterogeneous linear multiagent systems with arbitrarily large constant, time-varying, or distributed communication delays. Novel distributed dynamic controllers are proposed for such multiagent systems with fixed and switching directed communication topologies, respectively. It is shown that the controlled heterogeneous linear multiagent system can reach consensus for arbitrarily large constant, time-varying, and distributed communication delays under some sufficient conditions...
May 23, 2017: IEEE Transactions on Cybernetics
https://www.readbyqxmd.com/read/28541231/distributed-time-varying-formation-robust-tracking-for-general-linear-multiagent-systems-with-parameter-uncertainties-and-external-disturbances
#3
Yongzhao Hua, Xiwang Dong, Qingdong Li, Zhang Ren
This paper investigates the time-varying formation robust tracking problems for high-order linear multiagent systems with a leader of unknown control input in the presence of heterogeneous parameter uncertainties and external disturbances. The followers need to accomplish an expected time-varying formation in the state space and track the state trajectory produced by the leader simultaneously. First, a time-varying formation robust tracking protocol with a totally distributed form is proposed utilizing the neighborhood state information...
May 18, 2017: IEEE Transactions on Cybernetics
https://www.readbyqxmd.com/read/28534803/consensus-tracking-of-heterogeneous-discrete-time-networked-multiagent-systems-based-on-the-networked-predictive-control-scheme
#4
Yuxin Wei, Guo-Ping Liu
This paper studies the problem of consensus tracking for heterogeneous discrete-time networked multiagent systems (NMASs) with network-induced communication delay. By introducing the networked predictive control scheme, novel consensus tracking protocols are designed to ensure that states of the NMASs follow the external reference signal. One of the agents is defined as the leader agent, all the other agents are defined as the followers, and the external reference signal is always known by the leader agent, both cases where the external reference signal is available and unavailable to the follower agents are discussed in this paper...
May 16, 2017: IEEE Transactions on Cybernetics
https://www.readbyqxmd.com/read/28534766/a-new-perspective-to-graphical-characterization-of-multiagent-controllability
#5
Zhijian Ji, Haisheng Yu
Recently, graphical characterization of multiagent controllability has been studied extensively. A major effort in the study is to determine controllability directly from topology structures of communication graphs. In this paper, we proposed the concept of controllability destructive nodes, which indicates that the difficulty in graphical characterization turns out to be the identification of topology structures of controllability destructive nodes. It is shown that each kind of double and triple controllability destructive nodes happens to have a uniform topology structure which can be defined similarly...
June 2017: IEEE Transactions on Cybernetics
https://www.readbyqxmd.com/read/28531268/implementation-of-an-integrated-approach-to-the-national-hiv-aids-strategy-for-improving-human-immunodeficiency-virus-care-for-youths
#6
J Dennis Fortenberry, Linda J Koenig, Bill G Kapogiannis, Carrie L Jeffries, Jonathan M Ellen, Craig M Wilson
Importance: Youths aged 13 to 24 years old living with human immunodeficiency virus (HIV) are less likely than adults to receive the health and prevention benefits of HIV treatments, with only a small proportion having achieved sustained viral suppression. These age-related disparities in HIV continuum of care are owing in part to the unique developmental issues of adolescents and young adults as well as the complexity and fragmentation of HIV care and related services. This article summarizes a national, multiagency, and multilevel approach to HIV care for newly diagnosed youths designed to bridge some of these fragmentations by addressing National HIV/AIDS Strategy goals for people living with HIV...
May 22, 2017: JAMA Pediatrics
https://www.readbyqxmd.com/read/28489555/distributed-adaptive-containment-control-for-a-class-of-nonlinear-multiagent-systems-with-input-quantization
#7
Chenliang Wang, Changyun Wen, Qinglei Hu, Wei Wang, Xiuyu Zhang
This paper is devoted to distributed adaptive containment control for a class of nonlinear multiagent systems with input quantization. By employing a matrix factorization and a novel matrix normalization technique, some assumptions involving control gain matrices in existing results are relaxed. By fusing the techniques of sliding mode control and backstepping control, a two-step design method is proposed to construct controllers and, with the aid of neural networks, all system nonlinearities are allowed to be unknown...
May 5, 2017: IEEE Transactions on Neural Networks and Learning Systems
https://www.readbyqxmd.com/read/28475067/distributed-optimal-consensus-over-resource-allocation-network-and-its-application-to-dynamical-economic-dispatch
#8
Chaojie Li, Xinghuo Yu, Tingwen Huang, Xing He
The resource allocation problem is studied and reformulated by a distributed interior point method via a θ-logarithmic barrier. By the facilitation of the graph Laplacian, a fully distributed continuous-time multiagent system is developed for solving the problem. Specifically, to avoid high singularity of the θ-logarithmic barrier at boundary, an adaptive parameter switching strategy is introduced into this dynamical multiagent system. The convergence rate of the distributed algorithm is obtained. Moreover, a novel distributed primal-dual dynamical multiagent system is designed in a smart grid scenario to seek the saddle point of dynamical economic dispatch, which coincides with the optimal solution...
May 2, 2017: IEEE Transactions on Neural Networks and Learning Systems
https://www.readbyqxmd.com/read/28473849/directed-bee-colony-optimization-algorithm-to-solve-the-nurse-rostering-problem
#9
M Rajeswari, J Amudhavel, Sujatha Pothula, P Dhavachelvan
The Nurse Rostering Problem is an NP-hard combinatorial optimization, scheduling problem for assigning a set of nurses to shifts per day by considering both hard and soft constraints. A novel metaheuristic technique is required for solving Nurse Rostering Problem (NRP). This work proposes a metaheuristic technique called Directed Bee Colony Optimization Algorithm using the Modified Nelder-Mead Method for solving the NRP. To solve the NRP, the authors used a multiobjective mathematical programming model and proposed a methodology for the adaptation of a Multiobjective Directed Bee Colony Optimization (MODBCO)...
2017: Computational Intelligence and Neuroscience
https://www.readbyqxmd.com/read/28461032/clinical-characteristics-and-prognosis-of-ultra-high-risk-gestational-trophoblastic-neoplasia-patients-a-retrospective-cohort-study
#10
Yujia Kong, Junjun Yang, Fang Jiang, Jun Zhao, Tong Ren, Jie Li, Xiaoyu Wang, Fengzhi Feng, Xirun Wan, Yang Xiang
OBJECTIVE: The gestational trophoblastic neoplasia (GTN) patients with the International Federation of Gynecology and Obstetrics (FIGO) score≥12 are defined as ultra high-risk GTN. This study aims to investigate the clinical characteristics, the treatment efficiency, and the prognosis of ultra high-risk GTN patients. METHODS: Between January 2002 and December 2015, medical record data of 143 GTN patients with FIGO score≥12 at Peking Union Medical College Hospital (PUMCH) were reviewed...
April 28, 2017: Gynecologic Oncology
https://www.readbyqxmd.com/read/28444622/a-brief-review-of-the-management-of-platinum-resistant-platinum-refractory-ovarian-cancer
#11
REVIEW
Bryan Oronsky, Carolyn M Ray, Alexander I Spira, Jane B Trepel, Corey A Carter, Hope M Cottrill
Ovarian cancer, which ranks fifth in cancer deaths among women, is the most lethal gynecologic malignancy. Epithelial ovarian cancer (EOC) is the most common histologic type, with the 5-year survival for all stages estimated at 45.6%. This rate increases to more than 70% in the minority of patients who are diagnosed at an early stage, but declines to 35% in the vast majority of patients diagnosed at advanced stage. Recurrent EOC is incurable. Platinum sensitivity (or lack thereof) is a major determinant of prognosis...
June 2017: Medical Oncology
https://www.readbyqxmd.com/read/28436912/distributed-position-based-consensus-of-second-order-multiagent-systems-with-continuous-intermittent-communication
#12
Qiang Song, Fang Liu, Guanghui Wen, Jinde Cao, Xinsong Yang
This paper considers the position-based consensus in a network of agents with double-integrator dynamics and directed topology. Two types of distributed observer algorithms are proposed to solve the consensus problem by utilizing continuous and intermittent position measurements, respectively, where each observer does not interact with any other observers. For the case of continuous communication between network agents, some convergence conditions are derived for reaching consensus in the network with a single constant delay or multiple time-varying delays on the basis of the eigenvalue analysis and the descriptor method...
April 24, 2017: IEEE Transactions on Cybernetics
https://www.readbyqxmd.com/read/28436891/off-policy-reinforcement-learning-for-synchronization-in-multiagent-graphical-games
#13
Jinna Li, Hamidreza Modares, Tianyou Chai, Frank L Lewis, Lihua Xie
This paper develops an off-policy reinforcement learning (RL) algorithm to solve optimal synchronization of multiagent systems. This is accomplished by using the framework of graphical games. In contrast to traditional control protocols, which require complete knowledge of agent dynamics, the proposed off-policy RL algorithm is a model-free approach, in that it solves the optimal synchronization problem without knowing any knowledge of the agent dynamics. A prescribed control policy, called behavior policy, is applied to each agent to generate and collect data for learning...
April 17, 2017: IEEE Transactions on Neural Networks and Learning Systems
https://www.readbyqxmd.com/read/28422670/observer-based-robust-coordinated-control-of-multiagent-systems-with-input-saturation
#14
Xiaoling Wang, Housheng Su, Michael Z Q Chen, Xiaofan Wang
This paper addresses the robust semiglobal coordinated control of multiple-input multiple-output multiagent systems with input saturation together with dead zone and input additive disturbance. Observer-based coordinated control protocol is constructed, by combining the parameterized low-and-high-gain feedback technique and the high-gain observer design approach. It is shown that, under some mild assumptions on agents' intrinsic dynamics, the robust semiglobal consensus or robust semiglobal swarm can be approached for undirected connected multiagent systems...
April 13, 2017: IEEE Transactions on Neural Networks and Learning Systems
https://www.readbyqxmd.com/read/28419486/population-pharmacokinetic-analysis-of-bortezomib-in-pediatric-leukemia-patients-model-based-support-for-body-surface-area-based-dosing-over-the-2-to-16-year-age-range
#15
Michael J Hanley, Diane R Mould, Timothy J Taylor, Neeraj Gupta, Kaveri Suryanarayan, Rachel Neuwirth, Dixie-Lee Esseltine, Terzah M Horton, Richard Aplenc, Todd A Alonzo, Xiaomin Lu, Ashley Milton, Karthik Venkatakrishnan
This population analysis described the pharmacokinetics of bortezomib after twice-weekly, repeat-dose, intravenous administration in pediatric patients participating in 2 clinical trials: the phase 2 AALL07P1 (NCT00873093) trial in relapsed acute lymphoblastic leukemia and the phase 3 AAML1031 (NCT01371981) trial in de novo acute myelogenous leukemia. The sources of variability in the pharmacokinetic parameters were characterized and quantified to support dosing recommendations. Patients received intravenous bortezomib 1...
April 18, 2017: Journal of Clinical Pharmacology
https://www.readbyqxmd.com/read/28400632/management-strategies-for-mycosis-fungoides-in-india
#16
Tanumay Raychaudhury
Mycosis fungoides is the most common primary cutaneous T-cell lymphoma. The approach to diagnosis and further follow-up is outlined. Evidence for interventions is based classically on a Tumor Node Metastasis Blood TNMB "stage-based" approach. The treatment options in India are limited. The options as per risk stratification and prognostic index are discussed. Early stages and low-risk patients can be managed with expectant policy or skin-directed therapies including topical steroids and phototherapy; intermediate-risk patients can be opted for interferons or retinoids or low dose methotrexate along with radiotherapy including total skin electron beam therapy while high-risk patients are managed most often with single agent or multiagent palliative chemotherapy...
March 2017: Indian Journal of Dermatology
https://www.readbyqxmd.com/read/28398275/natural-killer-t-cell-lymphomas-in-pediatric-and-adolescent-patients
#17
REVIEW
Amanda M Termuhlen
Natural killer/T-cell (NK/T-cell) lymphomas are rare in children and adolescents and consist predominantly of nasal-type extranodal NK/T-cell lymphomas. More than half of pediatric/adolescent patients with NK/T-cell lymphomas present with localized nasal/sinus involvement, but the disease may involve many organs. NK/T-cell lymphoma cells are cytotoxic and associated with necrosis and angioinvasion; they express CD56, CD2, cytoplasmic CD3 epsilon, and to a variable degree CD30. The cells contain Epstein-Barr virus (EBV)-encoded RNA...
March 2017: Clinical Advances in Hematology & Oncology: H&O
https://www.readbyqxmd.com/read/28392674/interventions-to-improve-the-response-of-professionals-to-children-exposed-to-domestic-violence-and-abuse-a-systematic-review
#18
William Turner, Marianne Hester, Jonathan Broad, Eszter Szilassy, Gene Feder, Jessica Drinkwater, Adam Firth, Nicky Stanley
Exposure of children to domestic violence and abuse (DVA) is a form of child maltreatment with short- and long-term behavioural and mental health impact. Health care professionals are generally uncertain about how to respond to domestic violence and are particularly unclear about best practice with regards to children's exposure and their role in a multiagency response. In this systematic review, we report educational and structural or whole-system interventions that aim to improve professionals' understanding of, and response to, DVA survivors and their children...
January 2017: Child Abuse Review
https://www.readbyqxmd.com/read/28384435/birthing-on-country-in-our-community-a-case-study-of-engaging-stakeholders-and-developing-a-best-practice-indigenous-maternity-service-in-an-urban-setting
#19
Sue Kildea, Sophie Hickey, Carmel Nelson, Jody Currie, Adrian Carson, Maree Reynolds, Kay Wilson, Sue Kruske, Megan Passey, Yvette Roe, Roianne West, Anton Clifford, Machellee Kosiak, Shannon Watego, Sally Tracy
Developing high-quality and culturally responsive maternal and infant health services is a critical part of 'closing the gap' in health disparities between Aboriginal and Torres Strait Islander people and other Australians. The National Maternity Services Plan led work that describes and recommends Birthing on Country best-practice maternity care adaptable from urban to very remote settings, yet few examples exist in Australia. This paper demonstrates Birthing on Country principles can be applied in the urban setting, presenting our experience establishing and developing a Birthing on Country partnership service model in Brisbane, Australia...
April 7, 2017: Australian Health Review: a Publication of the Australian Hospital Association
https://www.readbyqxmd.com/read/28380078/multiagent-cooperation-and-competition-with-deep-reinforcement-learning
#20
Ardi Tampuu, Tambet Matiisen, Dorian Kodelja, Ilya Kuzovkin, Kristjan Korjus, Juhan Aru, Jaan Aru, Raul Vicente
Evolution of cooperation and competition can appear when multiple adaptive agents share a biological, social, or technological niche. In the present work we study how cooperation and competition emerge between autonomous agents that learn by reinforcement while using only their raw visual input as the state representation. In particular, we extend the Deep Q-Learning framework to multiagent environments to investigate the interaction between two learning agents in the well-known video game Pong. By manipulating the classical rewarding scheme of Pong we show how competitive and collaborative behaviors emerge...
2017: PloS One
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