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A Comprehensive Simulation Study on Cu Trace damage and Cu/Polyimide Interface delamination of rdLs in Fan-out Wafer Level Package Under Hygro-thermo-mechanical Loads 26

A Comprehensive Simulation Study on Cu Trace Damage and Cu/P...

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26th Electronics Packaging Technology Conference, EPTC 2024

作者： Luo, Ming-Sheng Lyu, Guang-Chao deng, Jia-Wei Zhang, Xin-Ping School of Materials Science and Engineering Guangdong Provincial Engineering Technology R&D Center of Electronic Packaging Materials and Reliability South China University of Technology Guangzhou510640 China

ISBN: (纸本)9798331522001

The current study investigates the influence of moisture on the delamination of Cu/Polyimide (PI) interfaces and cracking of Cu traces within the redistribution layers (rdLs) of fan-out wafer level packages (FOWLPs) containing two dies during the reflow process, utilizing finite element simulation. The crack initiation and the delamination behavior of Cu/PI interfaces are analyzed using the cohesive zone model (CZM) based on interface fracture mechanics. The influences of the number of rdL layers and thickness of Cu traces on interface damage and trace stress concentration are also studied. The findings indicate that crack formation and delamination of interfaces are most likely to occur at the edge of the interface between the top layer of Cu trace and the polyimide in die-to-die (d2d) region. The presence of hygro-swelling stress exacerbates interfacial damage. Moreover, the degradation of the Cu/PI interface intensifies with an increase in the number of rdL layers. While Cu trace is prone to stress concentration at the junction with the pad, the impact of moisture on Cu trace stress at 260 °C is relatively small. © 2024 IEEE.

关键词： delamination

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A Quantitative Characterization of the Crack driving Force of the Popcorn-type Failure in Mold-Underfilled Package under Hygro-thermo-vapor Loads by Finite Element Based Fracture Mechanics 26

A Quantitative Characterization of the Crack Driving Force o...

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26th Electronics Packaging Technology Conference, EPTC 2024

作者： Lyu, Guang-Chao Luo, Ming-Sheng Zhang, Xin-Ping School of Materials Science and Engineering Guangdong Provincial Engineering Technology R&D Center of Electronic Packaging Materials and Reliability South China University of Technology Guangzhou510640 China

ISBN: (纸本)9798331522001

This study investigates the combined effects of hygroscopic expansion, thermal expansion and vapor pressure on the reliability of molded underfill flip-chip (MUF FC) packages using finite element analysis. The moisture concentration distributions during MSL 1 preconditioning and the reflow process were first determined. Moisture diffusion under varying temperature conditions during reflow was simulated using the internal source approach. Fracture behavior at the MUF/die interface, specifically at the interface crack tip and the die corner, was analyzed for different crack lengths based on fracture mechanics. It has been found that vapor pressure loading becomes the dominant driving force for interfacial crack propagation and deflection at the die corner when the crack extends to a certain extent. Under vapor pressure loading, the Mode I driving force is predominant at the interface crack tip, while under moisture and thermal loads, the crack driving force is influenced by both Mode I and Mode II components. In addition, the direction of crack deflection at the die corner, which is predicted using the maximum tangential stress (MTS) criterion under the vapor pressure loading condition, is significantly different from that under moisture and thermal loads. In practical engineering, the cracking angle can serve as a key factor in analyzing the primary types of loads that lead to structural damage and device failure. The conclusions derived from the study enhance the understanding of popcorn failure mechanisms in electronic packages and provide valuable insights for research related to integrated circuit (IC) reliability. © 2024 IEEE.

关键词： Crack tips

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A Comparative Analysis of Fraud detection from diverse datasets to Algorithmic Performance 8

A Comparative Analysis of Fraud Detection from Diverse Datas...

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8th International Conference on Computer Science and engineering, UBMK 2023

作者： Iscan, Can Nardemir, Mehmet Akif Akbulut, Fatma Patlar Formica Ai R&d Center Istanbul Turkey Istanbul Kültür University Department of Computer Engineering Istanbul Turkey

ISBN: (纸本)9798350340815

The growth of e-wallets and the ease with which credit card information may be obtained online have contributed to the rise of credit card fraud in the digital age. In order to detect and prevent fraudulent acts in these areas, advanced and effective fraud detection systems must be created. In this work, we describe the results of a deep dive into the field of fraud detection using electronic money and credit card transactions as case studies. We investigate the most recent advances in deep learning, to tackle the challenging problem of fraud detection in these advanced settings. We conduct comprehensive experiments, utilizing e-wallet and credit card transaction datasets, to experimentally assess the performance of the suggested models. In terms of detecting and preventing fraudulent transactions, the experimental results provide more evidence that deep learning models are superior to more traditional rule-based paradigms. Using carefully constructed confusion matrices and receiver operating characteristic (rOC) curves, we elaborate on the models' ability to accurately discern and appraise the fraudulent undertones permeating the complexities of transactional data, as well as a variety of performance metrics. © 2023 IEEE.

关键词： deep learning

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Study on dynamic Characteristics of Superconducting Electrodynamic Maglev Train

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Journal of Harbin Institute of Technology(New Series) 2024年第5期31卷 32-40页

作者： Xiaonong Wang Jingyu Huang Yue Fei Cheng Zhen National Maglev Transportation Engineering R&D Center Tongji UniversityShanghai 201804China Chengdu Hangli(Group)Industrial Co. LtdChengdu 611937China

This study considers a superconducting electrodynamic maglev train of MLX01 *** characteristics of the electromagnetic spring coefficient of a single bogie under different magnetomotive force(MF) of the superconducting coil and standard air gap(Sag) were *** view of the small electromagnetic damping,a passive damping control strategy and an active damping control strategy were designed to increase the electromagnetic damping force between the superconducting coil and ground *** with the coupling numerical model of a single bogie,the vibration characteristics of the bogie in different directions with different damping control strategies were studied when the Sag and MF were *** results can provide important theoretical support for stable operation control of maglev trains.

关键词： superconducting electrodynamic maglev train electromagnetic spring characteristics damping control strategy dynamic characteristics

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Vibration condition analysis based on surface-underground engineering measurement parameters 7

Vibration condition analysis based on surface-underground en...

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7th International Conference on downhole Measurement and Control, ICdMC 2024

作者： Fan, Jinchao Fang, Chao Xu, Zhaohui Lin, Zili CNPC Engineering Technology R&D Company Limited Beijing102206 China National Engineering Research Center of Oil & Gas Drilling and Completion Technology Beijing102206 China

Accurate identification of abnormal vibration conditions is an important guarantee for drilling safety. In the process of deep oil and gas and unconventional oil and gas production, only the surface parameters can not effectively identify the abnormal vibration conditions in the drilling process. It is an important method to accurately identify abnormal vibration conditions to obtain the engineering parameters near the bit by using downhole parameter measurement tools and analyze the data combined with the surface logging data. To solve the above problems, this paper firstly studies the storage downhole parameter measurement tool, which can obtain the parameters of weight on bit, speed, torque, temperature, pressure and acceleration near the bit position. Finally, field tests are carried out, and the experimental results show that the tool can effectively obtain engineering parameters near the bit position, and can effectively identify abnormal downhole vibration conditions based on surface-downhole parameters, which can provide strong support for drilling operations. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Infill drilling

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design and Experiment of Turbine Generator Applied to Gas drilling 13th

Design and Experiment of Turbine Generator Applied to Gas Dr...

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13th International Field Exploration and development Conference, IFEdC 2023

作者： Wang, Lei Guo, Xian-Wei Shi, Hong-Jiang Cao, Chong ding, Hua-Hua CNPC Engineering Technology R&D Company Limited Beijing102206 China National Engineering Research Center of Oil and Gas Drilling and Completion Technology Beijing102206 China

ISBN: (纸本)9789819702558

With the maturity of electromagnetic wave transmission measurement while drilling technology, em wave transmission tools have been applied to the measurement and control of gas drilling well trajectory. However, due to the dry shaft wall and poor conductivity of gas drilling, especially the electromagnetic wave signal attenuates obviously in the formation, the transmission distance is affected. Enhance the emission power of electromagnetic waves could decrease the impact of signal attenuation, At present, measurement while drilling system is powered by battery in gas drilling, but the output of battery power is limited. The downhole generator technology can effectively improve the emission power of the signal source, However, due to the low gas density and compressibility, the conventional turbine components cannot drive the rotor shaft of the downhole generator as normal. This paper use the classical formula to determine the performance parameters of the gas drilling downhole generator body, Based on the study of the velocity vector triangle of the turbine blade in the two-dimensional flow field, analyzed the relationship between turbine output speed and torque in gas drilling conditions, then proposed to increase the torsional characteristics of turbine output by using planetary gear mechanism, through the above research, the air-drive turbine suitable for gas drilling is developed. CFd software is used to simulate the full three-dimensional flow field of the turbine, and the simulation results meet the design expectations. The test verifies that the steady-state output of the gas-driven turbine generator can reach 500 W, which meets the high-power emission requirements of electromagnetic wave transmission in gas drilling. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Electromagnetic waves

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Cost-Effectiveness of an Automatic Lubrication System for Bearings 1

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32nd International Conference on Organization and Technology of Maintenance, OTO 2023

作者： Yildiz, Serkan Apakhan, Murat Aksoy, Muharrem Hilmi IMAS R&D Center Mechanical Engineer Konya4200 Turkey Department of Mechanical Engineering Faculty of Engineering and Natural Sciences Konya Technical University Konya4200 Turkey

ISBN: (数字)9783031514944

ISBN: (纸本)9783031514937

Improper lubrication is a leading cause of bearing failures, accounting for half of all instances. Lubricating bearings with grease or oil forms a protective film that prevents direct metal-to-metal contact, reducing friction and overheating, and prolonging the bearing’s lifespan. Lubrication also acts as a barrier against foreign particles and wear. In this study, an analysis of automatic lubrication in a milling plant was carried out and compared to manuel lubrication. A milling factory with 22 roller mills with a total production capacity of 450 tons/day is considered. It is calculated that the failure of eight bearings in each mill roller due to lubrication issues results in a substantial cost of $39,000 over a two-year period. The Automatic lubrication system named "SmartLub" regulates lubricant quantity, timing, and application points, ensuring optimal lubrication. The choice of the oil pump was determined by considering both the viscosity of the oil and the head loss within the piping system utilized. By adhering to calculated frequencies, the system extends bearing service life to four years. Furthermore, the manual system reduces labor costs by $400 per roller mill every two years, while unplanned downtimes caused by lubrication issues are minimized. The automatic system eliminates the need for bi-monthly one-day shutdowns in the conventional lubrication systems, saving a total of six days per year. With an estimated lifespan of 20 years, the system achieved a payback period of 1.23 years, demonstrating its cost-effectiveness and long-term benefits. Overall, automation in bearing lubrication enhances machine efficiency, reduces spare parts and maintenance costs, and ensures optimal lubrication in the grain milling sector. Its implementation leads to extended bearing lifespan, reduced downtime, and improved profitability. © 2024, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Economic analysis

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IT Service desk Ticket Classification via Large Language Models 9

IT Service Desk Ticket Classification via Large Language Mod...

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9th International Conference on Computer Science and engineering, UBMK 2024

作者： Paket, Ezgi Şenerkek, Göksu Akyol, Fatma Betül Salman, Furkan Eczacibaş i Bilişim R&d Center DnA Lab Istanbul Turkey Yildiz Technical University Department of Computer Engineering Istanbul Turkey

ISBN: (纸本)9798350365887

Service desk systems are utilized in companies to enable employees to forward their issues or requests to IT support operators. These tickets are assigned by support operators to the appropriate categories based on their personal experiences and the manually prepared keyword-matching catalogs. The dependency on individual experiences and the difficulty of maintaining and updating manually prepared catalogs increase the misclassification rate. This study aims to address a challenging multi-class classification problem in the Turkish language, which includes 172 classes, by utilizing large language models (LLMs). For this purpose, next-generation LLMs such as Titan, Llama, and Mistral are compared with BErT-based models using zero-shot, fine-tuning, and rAG methods within this st udy. This research shows that BErT-based classification models outperform the LLMs, which are not specifically trained for classification tasks with several classes. © 2024 IEEE.

关键词： Classification (of information)

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Fabrication and Characterization of dECM/PVA/GelMA Tissue-Engineered Small-diameter Blood Vessels 30th

Fabrication and Characterization of dECM/PVA/GelMA Tissue-En...

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30th International Conference on Computational and Experimental engineering and Sciences, ICCES 2024

作者： Li, Bing Yuan, Xiaojuan Xiao, Boren du, Zhihua Chen, Junjie Li, Changliu Li, Xiangqin Liu, Tianqing Song, Kedong State Key Laboratory of Fine Chemicals Dalian R&D Center for Stem Cell and Tissue Engineering Dalian University of Technology Dalian116024 China

ISBN: (纸本)9783031687747

Vascular disease is a disease with high lethality, and the development of small-diameter tissue-engineered blood vessels (less than 6 mm in diameter) capable of replacing autologous damaged blood vessels is of great importance. In this study, we first prepared decellularized vascular matrix (dECM), a material that removes immunogenicity and retains active ingredients required for cell growth. Next, methacrylated gelatin (GelMA) was prepared by grafting methacrylic anhydride on gelatin according to a previous method, and a pre-gel solution was prepared by blending it with the polymer polyvinyl alcohol (PVA) and dECM. An isometric combination mold was designed by 3d modeling software, and the pregel solution was infused into the mold, and double cross-linked hydrogel tubes were prepared after repeated freeze-thaw and UV cross-linking and demolding. The results showed that dECM removed most of the dNA but retained a certain amount of active ingredients, such as collagen and glycosaminoglycans. The porous structure of the hydrogels was suitable for cell growth and had suitable mechanical properties. Cellular experiments also demonstrated that the dECM/PVA/GelMA hydrogels had good cytocompatibility and adhesion. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.

关键词： Tissue

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Antibacterial hydrogel with pH-responsive microcarriers of slow-release VEGF for bacterial infected wounds repair

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Journal of Materials Science & Technology 2023年第13期144卷 198-212页

作者： Xiaofei Xie Huan Lei daidi Fan Shaanxi Key Laboratory of Degradable Biomedical Materials School of Chemical EngineeringNorthwest UniversityXi’an 710069China Shaanxi R&D Center of Biomaterials and Fermentation Engineering School of Chemical EngineeringNorthwest UniversityXi’an 710069China Biotech.&Biomed.Research Institute Northwest UniversityXi’an 710069China

Bacterial infection causes wound inflammation and makes angiogenesis *** is urgent to develop effectively antibacterial and pro-vascularizing dressings for wound *** hydrogel is developed with pH-responsive drug-releasing microcarriers which were loaded with vascular endothelial growth factor(VEGF)that promotes angiogenesis and actively respond to wound pH for control and prolong VEGF *** surfaces of the microcarriers were coated with polydopamine which can reduce the silver nanoparticles(AgNPs)in situ,and dynamically crosslink with the polyacrylamide,which forms a stable slow-release system with different release behavior for the VEGF and *** hydrogel inhib-ited bacterial formation and accelerated wound *** the hydrogel dressing,83.3%±4.29%of the wound heals at day 7,which is 40.9%±8.5%higher than the non-treatment group in defect infected *** antibacterial properties of hydrogel down-regulate early inflammation-related cytokines,and the release of VEGF in the middle and late phases of wound healing in response to pH changes pro-motes angiogenesis and up-regulate the expression of angiogenesis-associated *** sequential release of antibacterial agents and pro-vascularizing agents in response to the change in wound microen-vironmental cues facilitate temporally controlled therapy that suites the need of different wound healing ***,the hydrogel loaded with multifunctional microcarriers that enable controlled release of AgNPs and VEGF is an effective system for treating infected wounds.

关键词： Antibacterial pH-responsive microcarriers Slow-release Infected wound repair

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