Sudden cardiac arrest, frequently triggered by cardiac fibrillation, remains a significant global health concern. Defibrillation is a critical medical procedure that relies on precise electrical pulses to restore norm...
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ISBN:
(数字)9798331532970
ISBN:
(纸本)9798331532987
Sudden cardiac arrest, frequently triggered by cardiac fibrillation, remains a significant global health concern. Defibrillation is a critical medical procedure that relies on precise electrical pulses to restore normal heart rhythm. To optimize pulse parameters, such as peak voltage and duration, we employ the Differential Evolution algorithm on a monophasic waveform. By utilizing the error between circuit simulation and targeted defibrillation parameters as an objective function, we aim to determine the optimal inductance and capacitance values of the defibrillator circuit. This approach enables the delivery of precisely tailored electrical shocks, potentially improving defibrillation success rates, reducing patient risk, and ultimately, contributing to advancements in cardiac care.
Understanding the physical channel characteristics of V2V communications is important, but it is neither cost-effective nor practical to have full information about them. Since there is always delay and data-loss duri...
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ISBN:
(数字)9798331528140
ISBN:
(纸本)9798331528157
Understanding the physical channel characteristics of V2V communications is important, but it is neither cost-effective nor practical to have full information about them. Since there is always delay and data-loss during communications, which are further accelerated when the wireless channel status and device parameters remain uncalibrated frequently, full or even partial information of the environment is not feasible, even for a short period. Moreover, the vehicular mobility can also introduce abrupt changes to communication. These uncertainties dictate that a system should be well-and adaptively-designed to handle changing information. V2V communications that exploit this information naturally serve as candidates for artificial Intelligence (AI) algorithms. Specifically, there are applications of cooperative learning strategies that are suitable, including machine learning, deep reinforcement learning, and deep multi-agent reinforcement learning. This paper applies novel Enhanced Deep Cooperative Q-Learning (DCO-DQN) model for V2V communication, to achieve the best trade-offs (latency/ reliability/safety) under various states, including short and long memory, asymptotic and non-asymptotic, possible and unpredictable outcomes scenarios. The proposed framework incorporates spatial wisdom and historical information into Euclidean spaces, accounting for the above behavior and challenges. For this reason, future V2V communication in 5G/6G networks may benefit from adopting our approach, as previously described. A thorough comparative study has been conducted to illustrate our advantages and shortcomings. Our analysis also offers insights on hybrid techniques and decentralized approaches, as possible means for future development.
This paper presents the study of a pair of primal-dual fuzzy linear programming and establishes duality results. It is based on parabolic concave membership functions. Choice of parabolic concave membership functions ...
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This paper presents the study of a pair of primal-dual fuzzy linear programming and establishes duality results. It is based on parabolic concave membership functions. Choice of parabolic concave membership functions makes it unique and leads to the nonlinear programming. Duality results have been established using the aspiration level approach. A numerical example is also taken to demonstrate the approach and verification of results.
We consider the problem of computing bounds for causal queries on causal graphs with unobserved confounders and discrete valued observed variables, where identifiability does not hold. Existing non-parametric approach...
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We consider the problem of computing bounds for causal queries on causal graphs with unobserved confounders and discrete valued observed variables, where identifiability does not hold. Existing non-parametric approaches for computing such bounds use linear programming (LP) formulations that quickly become intractable for existing solvers because the size of the LP grows exponentially in the number of edges in the causal graph. We show that this LP can be significantly pruned, allowing us to compute bounds for significantly larger causal inference problems compared to existing techniques. This pruning procedure allows us to compute bounds in closed form for a special class of problems, including a well-studied family of problems where multiple confounded treatments influence an outcome. We extend our pruning methodology to fractional LPs which compute bounds for causal queries which incorporate additional observations about the unit. We show that our methods provide significant runtime improvement compared to benchmarks in experiments and extend our results to the finite data setting. For causal inference without additional observations, we propose an efficient greedy heuristic that produces high quality bounds, and scales to problems that are several orders of magnitude larger than those for which the pruned LP can be solved.
In the era of big data, the scale and complexity of data are ever increasing, traditional data dimensionality reduction methods can no longer meet the requirements of data users. In this context, manifold learning has...
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ISBN:
(数字)9798331529482
ISBN:
(纸本)9798331529499
In the era of big data, the scale and complexity of data are ever increasing, traditional data dimensionality reduction methods can no longer meet the requirements of data users. In this context, manifold learning has now become an important research direction, which mainly achieves dimensionality reduction and mapping of nonlinear structural data in high-dimensional space to low-dimensional space, reduces data noise, and improves low-dimensional data representation ability. Locally linear embedding (LLE) is an important algorithm in manifold learning that projects data from high-dimensional space onto low-dimensional space while maintaining the linear relationship between data. However, the optimization objective function of LLE uses L2 norm measurement to approximate the error, which can easily amplify or reduce the error and cause oscillation in the error measurement. Therefore, in this paper, L1 norm instead of L2 norm is used to overcome this drawback, but introduces a new problem of the objective function becoming a non-smooth function. To solve this problem, in this paper, a derivative-free optimization method, which is also a swarm intelligence method called scrambled Halton sequence initialized frilled lizard optimization has been proposed, and via numerical experiment, its reliability and effectiveness has been verified.
To optimize objectives that require extensive simulations, engineers need a powerful algorithm that can run in parallel to minimize wall-clock time. Evolutionary algorithms excel in both regards: they are powerful opt...
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ISBN:
(数字)9798331508272
ISBN:
(纸本)9798331508289
To optimize objectives that require extensive simulations, engineers need a powerful algorithm that can run in parallel to minimize wall-clock time. Evolutionary algorithms excel in both regards: they are powerful optimizers that can be implemented in parallel by assigning one processor to each population member. This paper, however, addresses the question: How can we minimize a simulation's wall-clock time if we have many more processors than there are population members? Our solution is the multi-child differential evolution (MCDE) algorithm in which each parent competes against more than one child. We benchmarked the scaling performance of the MCDE version of classic DE with a test bed of ten functions. We also compared MCDE to a parallel CMA-ES variant with three of our test bed's functions. Results from both experiments show that MCDE achieves a significant speedup that scales well with the number of processors.
In the context of industrial upgrading, the exponential growth of computational demands for big data processing has emerged as a critical challenge. Cloud computing, with its evolving technological capabilities, prese...
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ISBN:
(数字)9798331536169
ISBN:
(纸本)9798331536176
In the context of industrial upgrading, the exponential growth of computational demands for big data processing has emerged as a critical challenge. Cloud computing, with its evolving technological capabilities, presents a viable solution to address these escalating computational requirements. This study focuses on optimizing resource allocation efficiency through the establishment of a multiobjective optimization framework for cloud computing systems. Specifically, we formulate mathematical representations of objective functions and constraints while detailing corresponding encoding/decoding methodologies. The research employs the Non-dominated Sorting Genetic Algorithm II (NSGA-II) to resolve task scheduling dilemmas in cloud environments, simultaneously optimizing makespan and total computational time through innovative applications of nondominated sorting and congestion distance comparison. A series of multi-scale comparative experiments demonstrate the algorithm's superior performance over conventional scheduling approaches.
We study a Bayesian persuasion problem with externalities. In this model, a principal sends signals to inform multiple agents about the state of the world. Simultaneously, due to the existence of externalities in the ...
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The purpose of this article is to introduce two indicators designed to evaluate and consequently influence the indirect emissions related to the operation of an EV. The first indicator, denoted as “Electric Vehicle C...
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The purpose of this article is to introduce two indicators designed to evaluate and consequently influence the indirect emissions related to the operation of an EV. The first indicator, denoted as “Electric Vehicle CarbonFlex Potential” indicator, evaluates an EV's maximum and minimum achievable carbon emissions using an optimization approach and compares the user's resultant indirect carbon emissions to these boundaries, therefore, this indicator compares the users behavior to the optimal best and worst cases. The second indicator is “EcoCharge Time” indicator, which provides feedback to an EV user based on their charging behavior on the best and worst times of charging the vehicle in a day. Since human behavior cannot be controlled, such indicators are essential tools for influencing the behavior of EV users toward a desired optimal, in this case, a charging schedule with the lowest possible overall indirect emissions. The proposed indicators were tested on an EV dataset using the carbon intensity data from a number of countries and the results show that there exists considerable flexibility potential. Additionally, the results also showed the best charging times, which were typically clustered around, allowing for ease of use and understanding.
Considering the impact of extreme weather on the reliability of the power system is of great significance and value. First, the N-k uncertainty set is defined to describe the fault scenarios of generators and transmis...
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ISBN:
(数字)9798331517540
ISBN:
(纸本)9798331517557
Considering the impact of extreme weather on the reliability of the power system is of great significance and value. First, the N-k uncertainty set is defined to describe the fault scenarios of generators and transmission lines. Next, the objective function and constraints of the transmission network expansion model are provided. The objective of the two-stage robust optimization planning model is a min-max-min problem. Therefore, the Column and Constraint Generation (C&CG) algorithm is used to solve the problem, iteratively obtaining the global optimal solution of the model. Finally, case study verifies the effectiveness of the transmission network source-network coordinated two-stage robust optimization planning model, demonstrating that it can achieve economic objectives while incorporating the reliability of transmission network planning and operation.
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