- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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[IEEE 2019 IEEE 16th India Council International Conference (INDICON) - Rajkot, India (2019.12.13-2019.12.15)] 2019 IEEE 16th India Council International Conference (INDICON) - Performance Comparison Between Bipolar and Unipolar Switching Scheme for a Single-Phase Inverter Based Stand-alone Photovoltaic System
摘要： Self-organizing network (SON) mechanisms reduce operational expenditure in cellular networks while enhancing the offered quality of service. Within a SON, self-healing aims to autonomously solve problems in the radio access network and to minimize their impact on the user. Self-healing comprises automatic fault detection, root cause analysis, fault compensation, and recovery. This paper presents a root cause analysis system based on fuzzy logic. A genetic algorithm is proposed for learning the rule base. The proposed method is adapted to the way of reasoning of troubleshooting experts, which ease knowledge acquisition and system output interpretation. Results show that the obtained results are comparable or even better than those obtained when the troubleshooting experts define the rules, with the clear benefit of not requiring the experts to define the system. In addition, the system is robust, since fine tuning of its parameters is not mandatory.
关键词： genetic algorithms,self-organizing networks (SONs),Fuzzy systems,troubleshooting,root cause analysis,self-healing,supervised learning
更新于2025-09-23 15:21:01
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[IEEE 2019 24th Microoptics Conference (MOC) - Toyama, Japan (2019.11.17-2019.11.20)] 2019 24th Microoptics Conference (MOC) - Patterned emission of organic light emitting diodes with laser irradiation
摘要： Self-healing networks aim to detect cells with service degradation, identify the fault cause of their problem, and execute compensation and repair actions. The development of this type of automatic system presents several challenges to be confronted. The first challenge is the scarce number of historically reported faults, which greatly complicates the evaluation of novel self-healing techniques. For this reason, in this paper, a system model to simulate faults in Long-Term Evolution (LTE) networks, along with their most significant key performance indicators, is proposed. Second, the expert knowledge required to build a self-healing system is usually not documented. Therefore, in this paper, a methodology to extract this information from a collection of reported cases is proposed. Finally, following the proposed methodology, an automatic fuzzy-logic-based system for fault identification in LTE networks is designed. Evaluation results show that the fuzzy system provides fault identification with a high success rate.
关键词： Long-Term Evolution (LTE),Diagnosis,fuzzy logic,fault identification,troubleshooting,root cause analysis,self-healing,fault management
更新于2025-09-23 15:21:01
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Dynamic Healable Polyurethane for Selective Laser Sintering
摘要： Selective laser sintering (SLS) is one of the mainstream 3D printing technologies. A major challenge for SLS technology is the lack of novel polymer powder materials with improved Z-direction strength. Herein, a dynamic polymer was utilized to solve the challenge of SLS. To verify this concept, novel cross-linked poly(chlorophenol-urethane) (PCP-PU) and poly(bromophenol-urethane) (PBP-PU) containing dynamic halogenated bisphenol carbamate bond were examined. The obtained dynamic polyurethane exhibited excellent mechanical strength and self-healing efficiency, in addition to SLS processing ability. A small molecule model study confirmed the dynamic reversible characteristics of the chlorinated bisphenol carbamate, which dissociates into isocyanate and hydroxyl at 120 °C and reforms at 80 °C, as confirmed by NMR and FT-IR. SLS 3D printing using the self-made healable PBP-PU powders was successfully realized. The interface interaction between the adjacent SLS layers can be significantly improved via dynamic chemical bond linking instead of traditional physical entanglement, which leads to an improved Z-direction mechanical strength. The SLS processed PBP-PU sample exhibits an X-axis tensile strengths of ~23 MPa and an elongation at break of ~600%. The Z-axis tensile strength is ~88% of X-axis’s, much higher than that of control TPU sample (~56%).
关键词： 3D printing,self-healing,SLS,polyurethane
更新于2025-09-23 15:21:01
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Vehicle-to-Home Usage Scenarios for Self-Consumption Improvement of a Residential Prosumer With Photovoltaic Roof
摘要： This letter presents a novel cell outage detection algorithm based on incoming handovers statistics. The main advantage of the proposed algorithm is that it uses neighbor measurements that allow to detect outage in two cases. First, when the cell in outage is able to report performance indicators; second, when these indicators are not available because the base station is affected. To evaluate the proposed algorithm and compare it with other approaches, a set of tests has been carried out using an LTE simulator and in a live LTE network.
关键词： LTE,handover,Cell outage detection,real network,self-healing
更新于2025-09-23 15:21:01
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Rapid On-Chip Healing of Metal Thin Films
摘要： Self-healing behavior, the ability to autonomously counteract damage, is observed in some inorganic materials, and it has recently been extended to various artificial systems. In metals, healing usually requires thermal activation by a furnace treatment that stimulates damage repair. High temperature exposure, however, renders these routes incompatible with temperature-sensitive systems such as on-chip microelectronic components. In this work, designing Ni/Al multilayers as on-chip heat sources, a concept for on-demand healing of metal films that no longer relies on external annealing, is demonstrated. The process is based on harvesting a solitary self-sustained heat wave that is produced by a solid-state reaction in the heat source to weld cracks in different metal films. Healing is activated at room temperature with a remarkably small current input and in situ probing reveals a large conductance recovery up to 500 nm wide cracks within 1 ms, orders of magnitude faster than furnace-based approaches. Intrinsic heat source healing represents a unique concept for rapid on-chip healing of metal films that will provide new flexibility to prevent failure in inaccessible electronic systems: from implantable healthcare devices, to space probe instrumentation.
关键词： reactive multilayers,self-healing,intrinsic heat source,thin films
更新于2025-09-23 15:21:01
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Organohalide Lead Perovskites: More Stable than Glass under Gamma-Ray Radiation
摘要： Organohalide metal perovskites have emerged as promising semiconductor materials for use as space solar cells and radiation detectors. However, there is a lack of study of their stability under operational conditions. Here a stability study of perovskite solar cells under gamma-rays and visible light simultaneously is reported. The perovskite active layers are shown to retain 96.8% of their initial power conversion efficiency under continuous irradiation of gamma-rays and light for 1535 h, where gamma-rays have an accumulated dose of 2.3 Mrad. In striking contrast, a glass substrate shows obvious loss of transmittance under the same irradiation conditions. The excellent stability of the perovskite solar cells benefits from the self-healing behavior to recover its efficiency loss from the early degradation induced by gamma-ray irradiation. Defect density characterization reveals that gamma-ray irradiation does not induce electronic trap states. These observations demonstrate the prospects of perovskite materials in applications of radiation detectors and space solar cells.
关键词： gamma-ray radiation,solar cells,self-healing,organohalide perovskites,outer space,stability
更新于2025-09-23 15:21:01
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Design of novel self-healing thermoplastic vulcanizates utilizing thermal/magnetic/light triggered shape memory effects
摘要： We designed novel self-healing thermoplastic vulcanizates (TPVs), achieving excellent thermal/magnetic/light triggered shape memory assisted self-healing behavior. Damage on polylactide (PLA)/epoxidized natural rubber (ENR)/Fe3O4 TPVs could be healed via three events synergistically: The shape memory effect of TPVs resulted in the physical contact of damaged surfaces; the desorption-absorption of ENR/Fe3O4 bound rubber promoted inter-diffusion of ENR chains, leading to the self-healing of ENR phase; ENR was grafted onto PLA segment to assist PLA rearranging and entangling again to achieve the repair of TPVs. This self-healing TPV was reported for the first time and paved the way to design next-generation self-healing materials.
关键词： multi-stimuli response,self-healing,PLA/ENR,thermoplastic vulcanizates,shape memory effect
更新于2025-09-23 15:21:01
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Data-Enabled Advancement of Computation in Engineering: A Robust Machine Learning Approach to Accelerating Variational Methods in Electromagnetics and Other Disciplines
摘要： One critical issue, for a wireless sensor network (WSN) to operate successfully, is to provide sufficient sensing coverage. Define the smart sensing environment as a sensing system with the capability to sense the environment and respond properly in an automated manner. In this paper, we target on smart sensing environments and deal with heterogeneous sensors (here sensor heterogeneity is defined as sensors having different sensing ranges) equipped with actuation facilities to assist in the sensor self-deployment. A coverage-aware sensor automation (CASA) protocol is proposed to realize an automated smart monitoring network. Two centralized algorithms are included in the CASA protocol suite: enhanced virtual forces algorithm with boundary forces (EVFA-B) and sensor self-organizing algorithm (SSOA). Unlike most previous works that tackle the deployment problem only partially, we intend to address the problem from both global deployment (EVFA-B) and local repairing (SSOA) perspectives. The EVFA-B protocol exerts weighted attractive and repulsive forces on each sensor based on predefined distance thresholds. Resultant forces then guide the sensors to their suitable positions with the objective of enhancing the sensing coverage (after a possibly random placement of sensors). Furthermore, in the presence of sensor energy depletions and/or unexpected failures, our SSOA algorithm is activated to perform local repair by repositioning sensors around the sensing void (uncovered area). This capability of local recovery is advantageous in terms of saving the communication and moving energies. Performance of the proposed sensor deployment strategies is evaluated in terms of surveillance coverage, monitoring density, network self-healing competence, and moving energy consumption. We also implement our CASA protocol suite in a real-life monitoring network (MoNet) to demonstrate the protocol feasibility and validate the MoNet detection capability of emergency events.
关键词： smart sensing environment,sensor automation,self-healing,coverage problem,Wireless sensor deployment
更新于2025-09-23 15:19:57
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Bioinspired photothermal conversion coatings with self-healing superhydrophobicity for efficient solar steam generation
摘要： Photothermal conversion materials are prone to contamination caused by microorganisms and mud in water and to damages caused by oxidative substances, corrosive liquids and ultraviolet light, thereby greatly limiting the practical application of solar steam generation. Inspired by lotuses, in this study, scalable, chemically and mechanically stable, and conductive photothermal conversion coatings with self-healing superhydrophobicity are fabricated by spraying a mixture of beeswax, multiwalled carbon nanotubes and polydimethylsiloxane. The resulting photothermal conversion coatings exhibit broadband light absorption ability and can thus efficiently generate steam under sunlight irradiation. The integration of superhydrophobicity provides the photothermal conversion coatings with a self-cleaning ability that can prevent the reduction of steam generation efficiency induced by microorganisms and mud in water. In addition, the photothermal conversion coatings are capable of healing damage to their superhydrophobicity through the migration of beeswax, providing long-lasting protection. Furthermore, the photothermal conversion coatings possess an electric steam generation ability, which allows the coatings to continuously generate steam when sunlight is not available. Considering their low maintenance requirement, simple preparation process and high cost effectiveness, photothermal conversion coatings with self-healing superhydrophobicity may be suitable to provide fresh water for remote/disaster areas.
关键词： self-healing,coatings,photothermal conversion,solar steam generation,superhydrophobicity
更新于2025-09-19 17:15:36
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Smart Golden Leaves Fabricated by Integrating Au Nanoparticles and Cellulose Nanofibers
摘要： A simple processing technology based on spontaneous arrangement of gold nanoparticles (AuNPs) on cellulose nanofibers (CNFs) makes it possible to form a gold leaf with superior mechanical, chemical and electrical characteristics with a small amount of gold (< 15 vol.%). The electrical resistivity of the AuNP/CNF hybrid film reached 8.7 × 10?? Ω cm at 13 vol.% corresponding to that of a gold plate (2.9 × 10?? Ω cm) through a distribution of AuNP inside the film in the form of a band. The AuNPs work not only as linkers between various CNFs in the hybrid structure but also as scaffolds. Self-assembly allows the formation of leaves on three-dimensional micrometer-sized substrates, on which it is impossible to form a uniform flexible metallic layer using conventional techniques such as sputtering, vapor deposition, and electroless plating. The hybrid film holds great promise as a novel gold leaf for a wide range of applications, including coatings, smart papers, electronic skins, and wearable devices owing to its unique combination of superior properties, as well as good productivity, processability, and renewability.
关键词： cellulose nanofiber,organic/inorganic hybrid film,self-healing,spontaneous binding,gold nanoparticle
更新于2025-09-19 17:15:36