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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 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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Virtual Instrumentation under Supervisory Control for Safe Water Level Monitoring 5

Virtual Instrumentation under Supervisory Control for Safe W...

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5th International Conference on Circuits, Control, Communication and Computing, I4C 2024

作者： Ezilarasan, M.r. Gnanaprakash, V. Sreelakshmy, r. Preethi, d. rajesh, G. rahul, S.G. Vel Tech Rangarajan Dr. Sagunthala R&d Institute of Science and Technology Department of Electronics and Communication Engineering Chennai India Vel Tech Rangarajan Dr. Sagunthala R&d Institute of Science and Technology Department of Computer Science Engineering Chennai India

ISBN: (纸本)9798331528539

Water supplies are essential to farming and agriculture productivity as well as to our standard of living. Traditional water supply and quality monitoring systems need a large workforce in addition to complicated infrastructure. Agriculture depends heavily on the ability to control the level of water of a water supply, such as a water tank, bore well, etc It is difficult to monitor water tanks in real time using traditional water distribution methods. We can adjust to the newest technology in order to remove the complexity and streamline the system. For the water level monitoring system, a PId Control scheme that is solely software-oriented is thus created using *** Internet of Things (IoT) concept is used for continuous monitoring. In addition to tracking usage and gathering data via Wi-Fi and LAN, the server also keeps an eye on how much water is wasted at each outlet due to overuse. An alert is mailed to the user to let them know when water usage exceeds a predetermined level. With the help of this, customers can utilise a laptop or mobile device with an internet connection to continuously monitor water levels To prevent hacking, it additionally offers verified user access to this system. The government and authorities may monitor and manage the water supply with the help of this suggested water level monitoring system, which also enables individuals, schools, hospitals, businesses, department stores, malls, and agricultural areas to keep track of how much water they waste. © 2024 IEEE.

关键词： Water tanks

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On Time-delay Power divider 8

On Time-Delay Power Divider

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8th International Conference on Electronic Technology and Information science, ICETIS 2023

作者： Liu, Zheng Zhang, Jian Lei, Xue National Digital Switching System Engineering and Technological R&D Center China

ISBN: (纸本)9781510666535

In this paper a 1 to 4 time-delay power-divider was provided. The phase and amplitude relation between each port was simulated. The time-delay between the port was 0.016 ns in the x-direction and 0.16 ns in the x-direction. The maximum amplitude difference between each port was 1 dB and the maximum phase difference error was ±6°. The S11 value was lower than -20 dB. The proposed time delay power divider can be applied to VICTS antenna to enhance the instantaneous bandwidth. © 2023 SPIE.

关键词： Time delay

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Simulation and implementation of a reconfigurable dual-function pixel

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Optoelectronics Letters 2024年第8期20卷 454-459页

作者： Shaher dwik Gurusamy Sasikala Department of Electronics&Communication Engineering School of Electrical&CommunicationVel Tech Rangarajan Dr Sagunthala R&D Institute of Science and TechnologyChennai 600062India

This paper presents the simulation and implementation of a reconfigurable pixel that serves both data acquisition and energy harvesting *** main topic focuses on switching between the two operating modes of the photodiode:photoconductive and photovoltaic *** proposed model can be used to design novel optical sensors with energy harvesting capability,such as position sensitive device(PSd)and complementary metal oxide semiconductor(CMOS)image sensors,which can extend the battery lifetime of the whole optical ***,we can overcome power supply problems like wiring and changing batteries frequently,especially in hard-to-reach places like space(cube satellites)or even underwater wireless optical communication(UWOC).The proposed pixel architecture offers the advantage of a minimalistic design with only four ***,it does come with a drawback in the form of higher noise *** simulation was achieved using MATLAB,and the implementation was performed using the programmable system-on-chip(PSoC)*** results showed that the functionality of the dual-function pixel is correct,and the scheduling of both energy harvesting and signal sensing functions was successfully achieved.

关键词： implementation harvesting function

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Axial Assembled Correspondence Network for Few-Shot Semantic Segmentation

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IEEE/CAA Journal of Automatica Sinica 2023年第3期10卷 711-721页

作者： Yu Liu Bin Jiang Jiaming Xu School of Automation Science and Engineering South China University of TechnologyGuangzhou 510640 R&D Center of Precision Electronic Manufacturing Technology Guangzhou Institute of Modern Industrial Technologyand also with the High Performance Motor and Intelligent Control Engineering Technology Research Center of Guangdong ProvinceGuangzhou 511458China School of Automation Science and Engineering South China University of TechnologyGuangzhou 510640China IEEE

Few-shot semantic segmentation aims at training a model that can segment novel classes in a query image with only a few densely annotated support *** remains a challenge because of large intra-class variations between the support and query *** approaches utilize 4d convolutions to mine semantic correspondence between the support and query ***,they still suffer from heavy computation,sparse correspondence,and large *** propose axial assembled correspondence network(AACNet)to alleviate these *** key point of AACNet is the proposed axial assembled 4d kernel,which constructs the basic block for semantic correspondence encoder(SCE).Furthermore,we propose the deblurring equations to provide more robust correspondence for the aforementioned SCE and design a novel fusion module to mix correspondences in a learnable *** on PASCAL-5~i reveal that our AACNet achieves a mean intersection-over-union score of 65.9%for 1-shot segmentation and 70.6%for 5-shot segmentation,surpassing the state-of-the-art method by 5.8%and 5.0%respectively.

关键词： Artificial intelligence computer vision deep convolutional neural network few-shot semantic segmentation

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Implementation of a Balancing Controller for A Humanoid robot driving Scooter 5

Implementation of a Balancing Controller for A Humanoid Robo...

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5th International Conference on Intelligent Communication Technologies and Virtual Mobile Networks, ICICV 2024

作者： Srinivasan, r. Kavitha, M. rajeev Kumar, M. Vel Tech Rangarajan Dr Sagunthala R&d Institute of Science and Technology Department of Computer Science and Engineering Chennai India

ISBN: (纸本)9798350385649

A two-wheel self-balancing robot is a technological advancement in robotics. during the last few years, research has gained momentum on self-balancing robots, two-wheel inverted pendulums. Without external control, a self-balancing robot would roll around the wheels' rotation axis and eventually fall. When the robot is driven in the right direction at the right speed, it will return to the right position. despite this, the robot is naturally unstable. robots tend to fall off their axis if their base or platform is unstable or unbalanced. The gyro chip provides the change in angle of the robot, so the PId controller can check the error in the angular position of the self-balancing robot's base. A microcontroller and sensor system are used to stabilize an unstable system based on such a control system. After the Kalman filter recognizes an error in the angle or speed, the Proportionality Integrative derivative (PId) calculates the error and sends the corrected signal to the robot. An open-source robotic 3d platform is used for the virtual demonstration of the paper (GAZEBO) and robotics Operated System (rOS) for the pre-build robotic packages. It can be used for a variety of purposes, including surveillance, transportation, and reducing accidents and traffic jams. © 2024 IEEE.

关键词： Kalman filters

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Crop Yield Prediction Using Machine Learning Techniques Based on Soil and Environment Traits - A Survey 2

Crop Yield Prediction Using Machine Learning Techniques Base...

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2nd International Conference on Emerging Trends in Information Technology and engineering, ic-ETITE 2024

作者： Mariammal, G. Sridevi, S. Computer Science and Engineering Vel Tech Rangarajan Dr. Sagunthala R&d Institute of Science and Technology Chennai India

ISBN: (纸本)9798350328202

In research, the examination of agriculture is increasing rapidly. Crop yield prediction is an important aspect in agriculture. In earlier days, farmers get good yielding. due to the inefficiency in soil nutrients level and climatic changes crop yield level decreasing day by day. Hence, estimating the production is a crucial role in agriculture area also it helps to farmer for storing and marketing their yielded products. For predicting the precise agricultural yield, a variety of techniques, including remote sensing and machine learning, are used. This paper discussed a number of strategies for predicting crop yields that had been used by various researchers. In accordance to this review, the deployment of machine learning in agriculture indicates more effective and precise farming with fewer human assistance, as well as higher quality goods. © 2024 IEEE.

关键词： remote sensing

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Electro-optic 3d snapshot of a laser wakefield accelerated kilo-ampere electron bunch

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Light(science & Applications) 2024年第5期13卷 823-834页

作者： Kai Huang Zhan Jin Nobuhiko Nakanii Tomonao Hosokai Masaki Kando Kansai Institute for Photon Science(KPSI) National Institutes for Quantum Science and Technology(QST)KyotoJapan. Laser Accelerator R&D Innovative Light Sources DivisionRIKEN SPring-8 CenterHyogoJapan. SANKEN Osaka UniversityOsakaJapan

Laser wakefield acceleration,as an advanced accelerator concept,has attracted great attentions for its ultrahigh acceleration gradient and the capability to produce high brightness electron *** three-dimensional(3d)density serves as an evaluation metric for the particle bunch quality and is intrinsically related to the applications of an *** its significance,this parameter has not been experimentally measured in the investigation of laser wakefield *** report on an electro-optic 3d snapshot of a laser wakefield electron bunch at a position outside the *** 3d shape of the electron bunch was detected by simultaneously performing optical transition radiation imaging and electro-optic *** 3d structures to a few micrometer levels were reconstructed using a genetic *** electron bunch possessed a transverse size of less than 30 *** current profile shows a multi-peak *** main peak had a duration of<10 fs and a peak current>1 *** maximum electron 3d number density was~9×10^(21)m^(-3).This research demonstrates a feasible way of 3d density monitoring on femtosecond kilo-ampere electron bunches,at any position of a beam transport line for relevant applications.

关键词： laser acceleration field

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Wireless, Multifunctional System-Integrated Programmable Soft robot

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Nano-Micro Letters 2025年第7期17卷 20-33页

作者： Sungkeun Han Jeong-Woong Shin Joong Hoon Lee Bowen Li Gwan-Jin Ko Tae-Min Jang Ankan dutta Won Bae Han Seung Min Yang dong-Je Kim Heeseok Kang Jun Hyeon Lim Chan-Hwi Eom So Jeong Choi Huanyu Cheng Suk-Won Hwang KU-KIST Graduate School of Converging Science and Technology Korea University Semiconductor R&D Center Samsung Electronics Co.Ltd. SK Hynix Department of Engineering Science and Mechanics The Pennsylvania State UniversityUniversity Park Center for Neural Engineering The Pennsylvania State UniversityState CollegeUniversity Park Department of Integrative Energy Engineering Korea University Hanwha Systems Co. Ltd. Department of Materials Science and Engineering The Pennsylvania State UniversityState CollegeUniversity Park Materials Research Institute The Pennsylvania State UniversityState CollegeUniversity Park Center for Biomaterials Biomedical Research InstituteKorea Institute of Science and Technology (KIST) Department of Mechanical Engineering The Pennsylvania State UniversityUniversity Park

Soft robots have partially or entirely provided versatile opportunities for issues or roles that cannot be addressed by conventional machine robots, although most studies are limited to designs, controls, or physical/mechanical motions. Here, we present a transformable, reconfigurable robotic platform created by the integration of magnetically responsive soft composite matrices with deformable multifunctional electronics. Magnetic compounds engineered to undergo phase transition at a low temperature can readily achieve reversible magnetization and conduct various changes of motions and shapes. Thin and flexible electronic system designed with mechanical dynamics does not interfere with movements of the soft electronic robot, and the performances of wireless circuit, sensors, and devices are independent of a variety of activities, all of which are verified by theoretical studies. demonstration of navigations and electronic operations in an artificial track highlights the potential of the integrated soft robot for on-demand, environments-responsive movements/metamorphoses, and optoelectrical detection and stimulation. Further improvements to a miniaturized, sophisticated system with material options enable in situ monitoring and treatment in envisioned areas such as biomedical implants.

关键词： reprogrammable magnetic soft robot Soft electronics Soft robotics Untethered multimodal locomotion Wireless

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