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37th IEEE International system-on-Chip Conference, SOCC 2024

作者： Syafalni, Infall Firdaus, Mohamad Imam Sutisna, Nana Adiono, Trio Juhana, Tutun Mulyawan, Rahmat Bandung Institute of Technology School of Electrical Engineering and Informatics Indonesia University Center of Excellence on Microelectronics Bandung Institute of Technology Indonesia The University of Tokyo System Design Laboratory School of Engineering Tokyo Japan

ISBN: (纸本)9798350377569

In this paper, we propose a novel dual-mode Q-learning hardware accelerator (DMQ) for shortest path and coverage area problems. The hardware accelerator design uses only an agent to tackle multiple modes, in this case, shortest path and coverage area problems for mobile robots. The work proposes a modified policy generator that supports two reward functions for the shortest path and coverage area. The coverage area mode has 4 × state spaces than that of the shortest path mode. We also explore some policy generators such as decreasing epsilon and greedy for the dual-mode Q-learning accelerator. Experimental results show that by using a greedy policy generator the learning rate of an agent is faster for both problems. Moreover, the hardware architecture requires only 1199 LUTs, 4 LUTRAMs, and 6 BRAMs for the dual-mode functions. With a throughput of 185.63 MHz, the proposed work outperforms other methods up to 13 × in energy efficiency. The proposed work is useful for disaster recovery, smart navigation, and other artificial intelligence applications. © 2024 IEEE.

关键词： Mobile robots

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Improving the ductility of laser directed energy deposited borated stainless steel by increasing laser power

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Journal of Manufacturing Processes 2025年 145卷 494-507页

作者： Huang, Sheng Li, Qingyu Zhang, Xiaoyu Cui, Bin Li, Dichen Zhang, Anfeng Miao, Kai State Key Laboratory for Manufacturing Systems Engineering School of Mechanical Engineering Xi'an Jiaotong University Xi'an710049 China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610213 China Department of Mechanical and Electrical Engineering Yuncheng University Yuncheng044000 China Co. Ltd. Chengdu610091 China

Borated stainless steels (BSSs) are extensively applied in the nuclear energy industry due to boron's excellent thermal neutron absorption capacity, but large and brittle borides formed during casting result in a low ductility. Here, a BSS was produced by laser directed energy deposition, and an investigation was conducted to analyze the impact of laser power on both the microstructure and mechanical properties of the deposited material. Fibrous borides with relatively low volume fraction in the overlapping zone resulted in higher ductility, while lamellar borides with relatively large volume fraction in the non-overlapping zone led to higher strength. As the laser power increased from 180 W to 330 W, the size of fibrous and lamellar eutectic borides and austenite increased significantly, the width of the soft overlapping zone increased by 2.27 times, and the elongation increased by 2.03 times, although yield strength and ultimate tensile strength decreased by 46.3 % and 31.7 %, respectively. As a result, these findings confirmed the feasibility of significantly improving the ductility of the as-deposited BSS by increasing the laser power. The work here provides a way to tailoring the mechanical properties of BSS produced by laser additive manufacturing. © 2025 The Society of Manufacturing Engineers

关键词： Ductility

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An Energy-Efficient Computing-in-Memory NN Processor With Set-Associate Blockwise Sparsity and Ping-Pong Weight Update

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IEEE Journal of Solid-State Circuits 2024年第5期59卷 1612-1627页

作者： Yue, Jinshan Liu, Yongpan Feng, Xiaoyu He, Yifan Wang, Jingyu Yuan, Zhe Zhan, Mingtao Liu, Jiaxin Su, Jian-Wei Chung, Yen-Lin Wu, Ping-Chun Hong, Li-Yang Chang, Meng-Fan Sun, Nan Dou, Chunmeng Li, Xueqing Liu, Ming Yang, Huazhong Tsinghua University Department of Electronic Engineering Beijing100084 China Chinese Academy of Sciences Institute of Microelectronics Beijing100029 China National Tsing Hua University Department of Electrical Engineering Hsinchu314040 Taiwan Frontier Institute of Chip and System State Key Laboratory of Integrated Chips and Systems Fudan University Shanghai200433 China

Computing-in-memory (CIM) chips have demonstrated the potential high energy efficiency for low-power neural network (NN) processors. Even with energy-efficient CIM macros, the existing system-level CIM chips still lack deep exploration on sparsity and large models, which prevents a higher system energy efficiency. This work presents a CIM NN processor with more sufficient support of sparsity and higher utilization rate. Three key innovations are proposed. First, a set-associate blockwise sparsity strategy is designed, which simultaneously saves execution time, power, and storage space. Second, a ping-pong weight update mechanism is proposed for a higher utilization rate, enabling simultaneous execution of CIM and write operations. Third, an efficient CIM macro is implemented with adaptive analog-digital converter (ADC) precision for better sparsity utilization and performance-accuracy trade-off. The 65-nm fabricated chip shows 9.5-TOPS/W system energy efficiency at 4-bit precision, with 6.25times actual improvement compared with a state-of-the-art CIM chip. Besides, this work supports high CIM execution accuracy on the ImageNet dataset. © 1966-2012 IEEE.

关键词： Neural networks

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Polarization-induced photocurrent switching effect in heterojunction photodiodes

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Nano Research 2023年第4期16卷 5503-5510页

作者： Dingbo Chen Yu-Chang Chen Guang Zeng Yu-Chun Li Xiao-Xi Li Dong Li Chao Shen Nan Chi Boon S.Ooi David Wei Zhang Hong-Liang Lu State Key Laboratory of ASIC and System Shanghai Institute of Intelligent Electronics&SystemsSchool of MicroelectronicsFudan UniversityShanghai 200433China Key Laboratory for Information Science of Electromagnetic Waves Department of Communication Science and EngineeringFudan UniversityShanghai 200433China Photonics Laboratory Division of ComputerElectricaland Mathematical Sciences and EngineeringKing Abdullah University of Science and Technology(KAUST)Thuwal 23955-6900Kingdom of Saudi Arabia

The unipolar photocurrent in conventional photodiodes(PDs)based on photovoltaic effect limits the output modes and potential versatility of these devices in *** photodiodes with photocurrent switching are emerging as a promising solution for obtaining photoelectric devices with unique and attractive functions,such as optical logic ***,we design an all-solid-state chip-scale ultraviolet(UV)PD based on a hybrid GaN heterojunction with engineered bipolar polarized electric *** introducing the polarization-induced photocurrent switching effect,the photocurrent direction can be switched in response to the wavelength of incident light at 0 V *** particular,the photocurrent direction exhibits negative when the irradiation wavelength is less than 315 nm,but positive when the wavelength is longer than 315 *** device shows a responsivity of up to−6.7 mA/W at 300 nm and 5.3 mA/W at 340 nm,*** particular,three special logic gates in response to different dual UV light inputs are demonstrated via a single bipolar PD,which may be beneficial for future multifunctional UV photonic integrated devices and systems.

关键词： GaN heterostructure ultraviolet(UV)photodiodes bipolar photocurrent optical logic device

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Research on workflow recognition for liver rupture repair surgery

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Mathematical Biosciences and engineering 2024年第2期21卷 1844-1856页

作者： Men, Yutao Zhao, Zixian Chen, Wei Wu, Hang Zhang, Guang Luo, Feng Yu, Ming Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical Engineering Tianjin University of Technology Tianjin300384 China Medical Support Technology Research Department Systems Engineering Institute Academy of Military Sciences People’s Liberation Army Tianjin300161 China National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin University of Technology Tianjin300384 China

Liver rupture repair surgery serves as one tool to treat liver rupture, especially beneficial for cases of mild liver rupture hemorrhage. Liver rupture can catalyze critical conditions such as hemorrhage and shock. Surgical workflow recognition in liver rupture repair surgery videos presents a significant task aimed at reducing surgical mistakes and enhancing the quality of surgeries conducted by surgeons. A liver rupture repair simulation surgical dataset is proposed in this paper which consists of 45 videos collaboratively completed by nine surgeons. Furthermore, an end-to-end SA-RLNet, a self attention-based recurrent convolutional neural network, is introduced in this paper. The self-attention mechanism is used to automatically identify the importance of input features in various instances and associate the relationships between input features. The accuracy of the surgical phase classification of the SA-RLNet approach is 90.6%. The present study demonstrates that the SA-RLNet approach shows strong generalization capabilities on the dataset. SA-RLNet has proved to be advantageous in capturing subtle variations between surgical phases. The application of surgical workflow recognition has promising feasibility in liver rupture repair surgery. ©2024 the Author(s), licensee AIMS Press. This is an open access article distributed under the terms of the Creative Commons.

关键词： Image classification

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Simulation and Optimization of In-Situ Integration Ultraviolet HEMT-LED Enabled by P-GaN Selective Epitaxy Growth

Simulation and Optimization of In-Situ Integration Ultraviol...

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SID International Symposium Digest of Technical Papers, 2023

作者： Zhang, Jingyang Huang, Wei Liu, Zhaojun Department of Electronic and Electrical Engineering Southern University of Science and Technology Guangdong Shenzhen518055 China A State Key Laboratory of ASIC and System Shanghai Institute of Intelligent Electronics and Systems School of Microelectronics Fudan University Shanghai200433 China

Based on previous work, the ultraviolet HEMT-LED we fabricated by selective epitaxy growth, this paper further performed simulation to explore the most appropriate p-GaN selection size. P-GaN grown by Selective Epitaxy Growth (SEG) can not only be employed as a junction termination to reduce the electric field crowding of the gate of HEMT, but also form an active region by contacting with 2-dimentional electron gas (2DEG). The simulation results provide an effective reference for the design of p-GaN grown by SEG, and further pave the way for the realization of the idea of integration through the selection of growth methods. © 2023, John Wiley and Sons Inc. All rights reserved.

关键词： Gallium nitride

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design and Simulation of Integrated Ultraviolet HEMT-LED enabled by P-GaN Selective Epitaxy Growth

Design and Simulation of Integrated Ultraviolet HEMT-LED ena...

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The 2023 International Conference on Display Technology, (ICDT 2023)

作者： Zhang, Jingyang Huang, Wei Liu, Zhaojun Department of electronic and electrical engineering Southern University of Science and Technology Guangdong Shenzhen518055 China A State Key Laboratory of ASIC and System Shanghai Institute of Intelligent Electronics & Systems School of Microelectronics Fudan University Shanghai200433 China

Based on previous work, the ultraviolet HEMT-LED we fabricated by selective epitaxy growth, this paper further performed simulation to explore the most appropriate p-GaN selection size. P- GaN grown by Selective Epitaxy Growth (SEG) can not only be employed as a junction termination to reduce the electric field crowding of the gate of HEMT, but also form an active region by contacting with 2-dimentional electron gas (2DEG). The simulation results provide an effective reference for the design of p-GaN grown by SEG, and further pave the way for the realization of the idea of integration through the selection of growth methods. © 2023, John Wiley and Sons Inc. All rights reserved.

关键词： Gallium nitride

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DMQ: Dual-Mode Q-Learning Hardware Accelerator for Shortest Path and Coverage Area

DMQ: Dual-Mode Q-Learning Hardware Accelerator for Shortest ...

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IEEE International SOC Conference

作者： Infall Syafalni Mohamad Imam Firdaus Nana Sutisna Trio Adiono Tutun Juhana Rahmat Mulyawan School of Electrical Engineering and Informatics Bandung Institute of Technology Indonesia University Center of Excellence on Microelectronics Bandung Institute of Technology Indonesia System Design Laboratory School of Engineering The University of Tokyo Tokyo Japan

ISBN: (数字)9798350377569

ISBN: (纸本)9798350377576

In this paper, we propose a novel dual-mode Q-learning hardware accelerator (DMQ) for shortest path and coverage area problems. The hardware accelerator design uses only an agent to tackle multiple modes, in this case, shortest path and coverage area problems for mobile robots. The work proposes a modified policy generator that supports two reward functions for the shortest path and coverage area. The coverage area mode has $4 \times$ state spaces than that of the shortest path mode. We also explore some policy generators such as decreasing epsilon and greedy for the dual-mode Q-learning accelerator. Experimental results show that by using a greedy policy generator the learning rate of an agent is faster for both problems. Moreover, the hardware architecture requires only 1199 LUTs, 4 LUTRAMs, and 6 BRAMs for the dual-mode functions. With a throughput of 185.63 MHz, the proposed work outperforms other methods up to $13 \times$ in energy efficiency. The proposed work is useful for disaster recovery, smart navigation, and other artificial intelligence applications.

关键词： Q-learning Navigation Disasters Throughput Generators Energy efficiency Table lookup Mobile robots Artificial intelligence Hardware acceleration

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Physical design of RISC-V based system-on-Chip using OpenLane

Physical Design of RISC-V based System-on-Chip using OpenLan...

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IEEE Asia-Pacific Conference on Circuits and systems

作者： Muhammad Fauzan Raihan Fadhil Yanuarsyah Muhammad Hanif Hibatullah Radithya Arisaputra Infall Syafalni Nana Sutisna Trio Adiono Makoto Ikeda School of Electrical Engineering and Informatics Bandung Institute of Technology Indonesia University Center of Excellence on Microelectronics Indonesia System Design Laboratory School of Engineering The University of Tokyo Tokyo Japan Graduate School of Engineering The University of Tokyo Tokyo Japan

ISBN: (数字)9798350378771

ISBN: (纸本)9798350378788

Open-source tools for designing integrated circuits are crucial for electrical engineering students. However, more references are necessary to promote the tools to the academic environments. This paper presents design and implementation of a PicoSoC (Pico system-on-Chip) using the OpenLane automated VLSI flow. The PicoSoC comprises several modules, including the PicoRV32 CPU, UART and SPI peripherals, and memory blocks. The design methodology encompasses RTL simulation, macro hardening, core hardening, full-chip hardening, and gatelevel simulation. The results indicate successful physical design and functional verification, demonstrating that the gate-level simulation outputs align with those from RTL simulation. The work is useful for designing the physical layout of digital circuits, SoC architecture development, and also promoting open-source IC design tools in academic environments.

关键词： Layout Logic gates Very large scale integration system-on-chip design tools Central Processing Unit Pins Hardware design languages Digital circuits Physical design

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Robust design of IRS-Aided Multi-Group Multicast system With Imperfect CSI

Robust Design of IRS-Aided Multi-Group Multicast System With...

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作者： Jiang, Weiheng Xiong, Peiyun Nie, Jiangtian Ding, Zhiguo Pan, Cunhua Xiong, Zehui Chongqing University School of Microelectronics and Communication Engineering Chongqing400044 China Nanyang Technological University School of Computer Science and Engineering Jurong West639798 Singapore Khalifa University Department of Electrical Engineering and Computer Science Abu Dhabi United Arab Emirates The University of Manchester Department of Electrical and Electronic Engineering ManchesterM13 9PL United Kingdom Southeast University National Mobile Communications Research Laboratory Nanjing211189 China Singapore University of Technology and Design Pillar of Information Systems Technology and Design Tampines487372 Singapore

In this paper, the robust design for the intelligent reflective surface (IRS) assisted wireless multi-group multicast system is considered, in which two optimization design problems under two different channel state information (CSI) error models are separately discussed, i.e., the fairness-based problems and the quality-of-service (QoS)-based problems for both the bounded CSI error model and the statistical CSI error model. In order to deal with the non-convex constraints of the considered problems, i.e., bounded CSI error based constraint and statistical CSI error based constraint, S-procedure is adopted to convert the non-convex SINR constraint with bounded CSI error into linear matrix inequalities (LMIs), and the Bernstein-type inequality is utilized to transform the outage probability constraint with statistical CSI error into a second-order cone (SOC) constraint and linear inequalities. Following that, two efficient algorithms based on alternate optimization (AO) are proposed to solve the fairness problems and QoS problems, wherein the semi-definite programming (SDP), penalty convex-concave procedure (CCP) and semi-definite relaxation (SDR) are utilized. Furthermore, we analyze the complexity of the proposed algorithms. Finally, some numerical simulation results are presented to verify the effectiveness of the proposed algorithms, and the impacts of the CSI error and the discrete precision of IRS reflection phase shift on the system performance are analyzed, which provides some insights for the IRS deployment and system robust design. © 2002-2012 IEEE.

关键词： Beamforming

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