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Analysis of an M/(G1G2)/1 Queue with Bernoulli Vacation and Server Breakdown

International Journal of Applied and Computational Mathematics 2023年第1期9卷 1-32页

作者： Begum, Anjana Choudhury, Gautam Mathematical Sciences Division Institute of Advanced Study in Science and Technology Paschim Boragaon Assam Guwahati 781035 India

In this article, an M/(G1G2)/1 queue with service interruption consisting of a definite repairability is analyzed in the steady-state regime. Here, the server, after completion of a service, is allowed to take in a single vacation under the Bernoulli schedule. For this model, probability generating function (PGF) for queue length distribution at arbitrary and service completion epoch are derived. Laplace Stieltjes Transform (LST) of a busy period distribution and waiting time distribution are obtained. In addition to these, some important performance measures such as the mean queue size and the mean waiting time of a customer are achieved. The reliability indices for this model are carried out and are included in the study. An optimal operation policy of the model in terms of total expected cost is developed at a lower cost. Finally, various numerical examples are presented in support of the theory. © 2022, The Author(s), under exclusive licence to Springer Nature India Private Limited.

关键词： Bernoulli Vacation Schedule (BVS) M/(G1G2)/1queue Reliability analysis Repair time Server breakdown

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SSP: A Simple and Safe Prompt Engineering for Visual Generation

SSP: A Simple and Safe Prompt Engineering for Visual Generat...

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2024 IEEE International Conference on Systems, Man, and Cybernetics, SMC 2024

作者： Cheng, Weijin Liu, Jianzhi Jiao, Ziyun Deng, Jiawen Ren, Fuji College of Computer Science and Engineering University of Electronic Science and Technology of China Chengdu China Shenzhen Institute for Advanced Study University of Electronic Science and Technology of China Shenzhen China

ISBN: (纸本)9781665410205

Prompt engineering aims to adapt an AI foundation model on the token level without weight updating. Recently, with the development of visual models, many researchers have begun to study visual generation quality improvement using prompt engineering. However, while those studies mainly aim to improve visual quality, they overlook the safe factors in prompts. We find that adding specific camera descriptions not only prevents these issues but also enhances visual quality. Consequently, we propose a simple and safe prompt engineering method (SSP) to improve visual generation quality by providing optimal camera descriptions. Specifically, we create a dataset from multi-datasets as original prompts. To select the optimal camera, we design an optimal camera matching approach and implement a classifier for original prompts capable of automatically matching. Appending camera descriptions to original prompts generates optimized prompts for further visual generation. Experiments demonstrate that SSP improves semantic consistency by an average of 16 % compared to others and safety metrics by 35.8%. © 2024 IEEE.

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Design strategies of performance-enhanced Se cathodes for Li-Se batteries and beyond

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Journal of Energy Chemistry 2023年第1期76卷 528-546,I0013页

作者： Weiling Qiu Xiang Long Huang Ye Wang Chi Feng Haining Ji Hua Kun Liu Shi Xue Dou Zhiming Wang Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054SichuanChina Institute for Superconducting and Electronic Materials Australian Institute for Innovative MaterialsUniversity of WollongongNSW 2500Australia School of Materials and Energy.University of Electronic Science and Technology of China Chengdu 610054SichuanChina Institute for Advanced Study Chengdu UniversityChengdu 610106SichuanChina Institute of Energy Materials Science University of Shanghai for Science and TechnologyShanghai 200093China

Lithium-selenium(Li-Se)batteries are deemed as an emerging high energy density electrochemical energy storage system owing to their high specific capacity and volume *** to their practicality,a series of critical challenges from the Se cathode side need to be overcome including low reactivity of bulk Se,shuttle effect of intermediates,sluggish redox kinetics of polyselenides,and volume change *** this review,recent progress on design strategies of functional Se cathodes are comprehensively summarized and *** the significance and key challenges,various efficient functionalized strategies for Se cathodes are presented,encompassing covalent bonding,nanostructure construction,heteroatom doping,component hybridization,and solid solution ***,the universality of these functional strategies are successfully extended into Na-Se batteries,K-Se batteries,and Mg-Se *** last,a brief summary is made and some perspectives are offered with the goal of guiding future research advances and further exploration of these strategies.

关键词： Metal-selenium batteries Se cathodes Carbons Nanostructure Materials design

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Riemann–Hilbert approach and N double-pole solutions for a nonlinear Schrödinger-type equation

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Chinese Physics B 2022年第11期31卷 164-171页

作者： Guofei Zhang Jingsong He Yi Cheng School of Mathematical Sciences University of Science and Technology of ChinaHefei 230026China Institute for Advanced Study Shenzhen UniversityShenzhen 518060China

We investigate the inverse scattering transform for the Schrödinger-type equation under zero boundary conditions with the Riemann–Hilbert(RH)*** the direct scattering process,the properties are given,such as Jost solutions,asymptotic behaviors,analyticity,the symmetries of the Jost solutions and the corresponding spectral *** the inverse scattering process,the matrix RH problem is constructed for this integrable equation base on analyzing the spectral ***,the reconstruction formula of potential and trace formula are also derived ***,N double-pole solutions of the nonlinear Schrödinger-type equation are obtained by solving the RH problems corresponding to the reflectionless ***,we present a single double-pole solution by taking some parameters,and it is analyzed in detail.

关键词： Schrödinger-type equation Riemann-Hilbert problem zero boundary conditions N double-pole solitons

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MOF-mediated synthesis of novel PtFeCoNiMn high-entropy nanoalloy as bifunctional oxygen electrocatalysts for zinc-air battery

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Nano Research 2024年第6期17卷 5288-5297页

作者： Mingkuan Xie Xin Xiao Duojie Wu Cheng Zhen Chunsheng Wu Wenjuan Wang Hao Nian Fayan Li Meng Danny Gu Qiang Xu Shenzhen Key Laboratory of Micro/Nano-Porous Functional Materials(SKLPM) Shenzhen 518055China Department of Chemistry Southern University of Science and TechnologyShenzhen 518055China Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055China SUSTech-Kyoto University Advanced Energy Materials Joint Innovation Laboratory(SKAEM-JIL) Shenzhen 518055China Key University Laboratory of Highly Efficient Utilization of Solar Energy and Sustainable Development of Guangdong Southern University of Science and TechnologyShenzhen 518055China Eastern Institute for Advanced Study Eastern Institute of TechnologyNingbo 315200China

High-entropy alloy(HEA)-based materials are expected to be promising oxygen electrocatalysts due to their exceptional *** electronic structure regulation of HEAs plays a pivotal role in enhancing their elctrocatalytic ***,PtFeCoNiMn nanoparticles(NPs)with subtle lattice distortions are constructed on metal-organic framework-derived nitrogen-doped carbon by an ultra-rapid Joule heating *** to the modulated electronic structure and the inherent cocktail effect of HEAs,the as-synthesized PtFeCoNiMn/NC exhibits superior bifunctional electrocatalytic performance with a positive half-wave potential of 0.863 V *** hydrogen electrode(RHE)for oxygen reduction reaction and a low overpotential of 357 mV at 10 mA·cm^(-2)for oxygen evolution *** assembled quasi-solid-state zinc-air battery using PtFeCoNiMn/NC as air electrode shows a high peak power density of 192.16 mW·cm^(-2),low charge−discharge voltage gap,and excellent durability over 500 cycles at 5 mA·cm^(-2).This work demonstrates an effective route for rational design of bifunctional nanostructured HEA electrocatalysts with favorable electronic structures,and opens up a fascinating directions for energy storage and conversion,and beyond.

关键词： oxygen reduction reaction oxygen evolution reaction high-entropy nano-alloy zinc-air battery

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Unveiling the size effect of nitrogen-doped carbon-supported copper-based catalysts on nitrate-to-ammonia electroreduction

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Nano Research 2024年第4期17卷 2438-2443页

作者： Ran Li Taotao Gao Wenxi Qiu Minghao Xie Zhaoyu Jin Panpan Li College of Materials Science and Engineering Sichuan UniversityChengdu 610065China Institute for Advanced Study Chengdu UniversityChengdu 610106China Materials Science and Engineering Program and Walker Department of Mechanical Engineering The University of Texas at AustinAustinTexas 78712USA Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054China

The electrocatalytic nitrate reduction reaction(NitRR)represents a promising approach toward achieving economically and environmentally sustainable ***,it remains a challenge to regulate the size effect of electrocatalysts to optimize the catalytic activity and ammonia ***,the Cu-based catalysts were tailored at the atomic level to exhibit a size gradient ranging from single-atom catalysts(SACs,0.15–0.35 nm)to single-cluster catalysts(SCCs,1.0–2.8 nm)and nanoparticles(NPs,20–30 nm),with the aim of studying the size effect for the NO_(3)^(-)-to-NH_(3) reduction ***,the Cu SCCs exhibit enhanced metal–substrate and metal–metal interactions by taking advantageous features of Cu SACs and Cu ***,Cu SCCs achieve exceptional electrocatalytic performance for the NitRR with a maximum Faradaic efficiency of ca.96%NH_(3)and the largest yield rate of ca.1.99 mg·h^(-1)·cm^(-2) at-0.5 V *** hydrogen electrode(RHE).The theoretical calculation further reveals the size effect and coordination environment on the high catalytic activity and selectivity for the *** work provides a promising various size-controlled design strategy for aerogel-based catalysts effectively applied in various electrocatalytic reactions.

关键词： nitrate electroreduction ammonia electrosynthesis size effect single-cluster catalyst

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Real-time evolution of up-conversion nanocrystals from tailored metastable intermediates

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Nano Research 2023年第1期16卷 1552-1557页

作者： Peng Zhang Xue Yu Ping Xia Zhenzhen Cui Jianhong Yi Caiju Li Peng Song Feng Zhao Ting Wang Jianbei Qiu Xuhui Xu Faculty of Materials Science and Engineering Key Laboratory of Advanced Materials of Yunnan ProvinceKunming University of Science and TechnologyKunming 650093China Yunnan AFPN Technology Company Limited Kunming 650093China School of Mechanical Engineering Institute for Advanced StudyInstitute for Advanced Materials Deformation and Damage from Multi-ScaleChengdu UniversityChengdu 610106China College of Materials and Chemistry&Chemical Engineering Chengdu University of TechnologyChengdu 610059China

In-situ observation of the growth and decomposition processes is significantly important for guiding the fabrication of upconversion nanocrystals(UCNCs)with high ***,the high crystallization energy and rapid nucleation rate of the corresponding crystals make real-time observation still a huge ***,the in-situ nucleation-growth-degradation processes of the UCNCs are investigated by employing tailored metastable intermediates,which possess a slowing-down nucleation rate under electron beam *** non-classical nucleation processes of the UCNCs,containing the coalescence of clusters and the subsequent crystallization,are ***,the Ostwald ripening and oriented attachment processes,which determine the particle size and morphology,are unambiguously ***,the degrading process of the UCNCs is observed to be triggered by surface *** work provides an insight into the real-time evolution dynamics of the UCNCs,which further sheds light on the fabrication of nano-sized up-conversion phosphors.

关键词： up-conversion nanocrystals metastable intermediates real-time evolution in-situ transmission electron microscopy(TEM)

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Heuristic Data-Driven Adaptive Model Predictive Control Strategy 28

Heuristic Data-Driven Adaptive Model Predictive Control Stra...

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28th International Conference on Automation and Computing, ICAC 2023

作者： Li, Ming Li, Yun Shenzhen Institute for Advanced Study University of Electronic Science and Technology of China Shenzhen518110 China

ISBN: (纸本)9798350335859

Model predictive control is a popular advanced control strategy, but its performance is largely limited by the accuracy of the predictive model, the learning ability of the model, and the capacity of solving the optimal control variables online. As it is often challenging to construct an error-free model, this paper proposes a heuristic data-driven adaptive model predictive control(A-MPC)framework to achieve precise control effects in uncertain environments. A - MPC combines the heuristic hill-climbing search strategy with a data-driven model thes conducting simple online optimisation for the prediction interval. After obtaining feedback from the environment, A-MPC uses gradient descent to update the prediction model synchronously to reduce the error between it and real environment and thus offers an adaptive ability. Experiments verify that the A-MPC algorithm offers a self-learning ability for unknown environments while achieving a better control effect. © 2023 IEEE.

关键词： Model predictive control

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Thermally activated delayed fluorescence carbazole-triazine dendrimer with bulky substituents

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Aggregate 2024年第1期5卷 236-243页

作者： Hiroki Ikebe Kohei Nakao Eri Hisamura Minori Furukori Yasuo Nakayama Takuya Hosokai Minlang Yang Guanting Liu Takuma Yasuda Ken Albrecht Interdisciplinary Graduate School of Engineering Sciences Kyushu UniversityFukuokaJapan Institute for Materials Chemistry and Engineering Kyushu UniversityKasugaJapan Department of Pure and Applied Chemistry Graduate School of Science and TechnologyTokyo University of ScienceNodaChibaJapan National Metrology Institute of Japan(NMIJ) National Institute of Advanced Industrial Science and Technology(AIST)TsukubaIbarakiJapan Institute for Advanced Study Kyushu UniversityNishi-kuFukuokaJapan

Carbazole-triazine dendrimers with a bulky terminal substituent were synthesized,and the thermally activated delayed fluorescence(TADF)property was *** to unsubstituted carbazole dendrimers,dendrimers with bulky terminal substituents showed comparable to better photoluminescence quantum yields(PLQY)in neat ***(PF)-substituted dendrimers showed the highest PLQY of 81%,a smallΔEst of 0.06 eV,and the fastest reverse intersystem crossing(RISC)rate of∼1×10^(5 )s^(−1) compared to other *** measurements of dendrimers and dendrons(fragments)indicate that the close proximity of the triplet energy of phenylfluorene-substituted carbazole dendrons(^(3)LE)to that of phenylfluorene-substituted dendrimers(^(1)CT,^(3)CT)contributes to RISC promotion and improves TADF *** modification fine-tunes the energy level and suppresses intermolecular interactions,and this study provides a guideline for designing efficient solution-processable and non-doped TADF materials.

关键词： dendrimer OLED TADF 1 INTRODUCTION Thermally activated delayed fluorescence(TADF)[1]materials which are inexpensive and highly efficient alternatives to fluorescent

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ECSFF: Exploring Efficient Cross-Scale Feature Fusion for Medical Image Segmentation 28

ECSFF: Exploring Efficient Cross-Scale Feature Fusion for Me...

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28th International Conference on Automation and Computing, ICAC 2023

作者： Ke, Yan Yu, Shui Wang, Zhonglai Li, Yun Shenzhen Institute for Advanced Study University of Electronic Science and Technology of China Shenzhen518110 China

ISBN: (纸本)9798350335859

In medical image segmentation, the greatly successful U-Net structure has become the industry standard and has achieved great success. However, existing methods all directly fuse high-dimensional features with low-dimensional ones without considering the difference between high-dimensional and low-dimensional features, making it difficult to fit in small data scenarios and hence limiting the performance. This paper proposes a transformer-based method for feature fusion. Specifically, anchor attention and self-attention are used to extract features. The anchor attention effectively fuses high-dimensional and low-dimensional features, while self-attention extracts general features. Fusion of the high-dimensional and low-dimensional features solves the semantic gap between the two features. At the same time, the fusion model draws on comparative learning to guide the skipped connection and upsampling for the fusion. In particular, this Cross-Scale fusion method uses a downsampled feature embeded as a negative sample, and uses the skipped connection output feature and the upsampled recovery feature as a positive sample. It then compares the direction of the regular constraint fusion feature, thus reducing model complexity. Experimental results show that this Cross-Scale fusion method produces more accurate segmentation performance, improving the Dice index by 2%-3% on the ISIC2018 dataset and the SegPC2021 dataset. © 2023 IEEE.

关键词： Semantics

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