Hoi‐Jun Yoo
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View article: An Overview of AI Hardware Architectures and Silicon for 3-D Spatial Computing Systems
An Overview of AI Hardware Architectures and Silicon for 3-D Spatial Computing Systems Open
As artificial intelligence (AI) advances, 3-D spatial computing has emerged as a key application in various fields. It interprets the 3-D space surrounding users and provides them with useful information. This article presents a survey of …
View article: DX2CT: Diffusion Model for 3D CT Reconstruction from Bi or Mono-planar 2D X-ray(s)
DX2CT: Diffusion Model for 3D CT Reconstruction from Bi or Mono-planar 2D X-ray(s) Open
Computational tomography (CT) provides high-resolution medical imaging, but it can expose patients to high radiation. X-ray scanners have low radiation exposure, but their resolutions are low. This paper proposes a new conditional diffusio…
View article: A 28.6 mJ/iter Stable Diffusion Processor for Text-to-Image Generation with Patch Similarity-based Sparsity Augmentation and Text-based Mixed-Precision
A 28.6 mJ/iter Stable Diffusion Processor for Text-to-Image Generation with Patch Similarity-based Sparsity Augmentation and Text-based Mixed-Precision Open
This paper presents an energy-efficient stable diffusion processor for text-to-image generation. While stable diffusion attained attention for high-quality image synthesis results, its inherent characteristics hinder its deployment on mobi…
View article: A-SSCC 2022 Continues Its Success With Its Hybrid Format, With a Record 594 Registrants: New ACE Program and “Start-Up!” Session Launched [Conference Reports]
A-SSCC 2022 Continues Its Success With Its Hybrid Format, With a Record 594 Registrants: New ACE Program and “Start-Up!” Session Launched [Conference Reports] Open
Provides society information that may include news, reviews or technical notes that should be of interest to practitioners and researchers.
View article: A 23-<i>μ</i>W Keyword Spotting IC With Ring-Oscillator-Based Time-Domain Feature Extraction
A 23-<i>μ</i>W Keyword Spotting IC With Ring-Oscillator-Based Time-Domain Feature Extraction Open
This article presents the first keyword spotting (KWS) IC that uses a ring-oscillator-based time-domain processing technique for its analog feature extractor (FEx). Its extensive usage of time-encoding schemes allows the analog audio signa…
View article: Energy-efficient Dense DNN Acceleration with Signed Bit-slice Architecture
Energy-efficient Dense DNN Acceleration with Signed Bit-slice Architecture Open
As the number of deep neural networks (DNNs) to be executed on a mobile system-on-chip (SoC) increases, the mobile SoC suffers from the real-time DNN acceleration within its limited hardware resources and power budget. Although the previou…
View article: A 23μW Solar-Powered Keyword-Spotting ASIC with Ring-Oscillator-Based Time-Domain Feature Extraction
A 23μW Solar-Powered Keyword-Spotting ASIC with Ring-Oscillator-Based Time-Domain Feature Extraction Open
Voice-controlled interfaces on acoustic Internet-of-Things (IoT) sensor nodes and mobile devices require integrated low-power always-on wake-up functions such as Voice Activity Detection (VAD) and Keyword Spotting (KWS) to ensure longer ba…
View article: Two-Step Spike Encoding Scheme and Architecture for Highly Sparse Spiking-Neural-Network
Two-Step Spike Encoding Scheme and Architecture for Highly Sparse Spiking-Neural-Network Open
This paper proposes a two-step spike encoding scheme, which consists of the source encoding and the process encoding for a high energy-efficient spiking-neural-network (SNN) acceleration. The eigen-train generation and its superposition ge…
View article: Energy-Efficient DNN Training Processors on Micro-AI Systems
Energy-Efficient DNN Training Processors on Micro-AI Systems Open
Many edge/mobile devices are now able to utilize deep neural networks (DNNs) thanks to the development of mobile DNN accelerators. Mobile DNN accelerators overcame the problems of limited computing resources and battery capacity by realizi…
View article: A 36-Channel Auto-Calibrated Front-End ASIC for a pMUT-Based Miniaturized 3-D Ultrasound System
A 36-Channel Auto-Calibrated Front-End ASIC for a pMUT-Based Miniaturized 3-D Ultrasound System Open
We present an area- and power-efficient application-specific integrated circuit (ASIC) for a miniaturized 3-D ultrasound system. The ASIC is designed to transmit pulse and receive echo through a 36-channel 2-D piezoelectric Micromachined U…
View article: GST: Group-Sparse Training for Accelerating Deep Reinforcement Learning
GST: Group-Sparse Training for Accelerating Deep Reinforcement Learning Open
Deep reinforcement learning (DRL) has shown remarkable success in sequential decision-making problems but suffers from a long training time to obtain such good performance. Many parallel and distributed DRL training approaches have been pr…
View article: An Overview of Energy-Efficient Hardware Accelerators for On-Device Deep-Neural-Network Training
An Overview of Energy-Efficient Hardware Accelerators for On-Device Deep-Neural-Network Training Open
Deep Neural Networks (DNNs) have been widely used in various artificial intelligence (AI) applications due to their overwhelming performance. Furthermore, recently, several algorithms have been reported that require on-device training to d…
View article: Extension of Direct Feedback Alignment to Convolutional and Recurrent Neural Network for Bio-plausible Deep Learning
Extension of Direct Feedback Alignment to Convolutional and Recurrent Neural Network for Bio-plausible Deep Learning Open
Throughout this paper, we focus on the improvement of the direct feedback alignment (DFA) algorithm and extend the usage of the DFA to convolutional and recurrent neural networks (CNNs and RNNs). Even though the DFA algorithm is biological…
View article: A 0.5V, 6.2μW, 0.059mm<sup>2</sup> Sinusoidal Current Generator IC with 0.088% THD for Bio-Impedance Sensing
A 0.5V, 6.2μW, 0.059mm<sup>2</sup> Sinusoidal Current Generator IC with 0.088% THD for Bio-Impedance Sensing Open
This paper presents the first sub-10$\\mu$W, sub-0.1% total harmonic\ndistortion (THD) sinusoidal current generator (CG) integrated circuit (IC) that\nis capable of 20kHz output for the bio-impedance (Bio-Z) sensing applications.\nTo benef…
View article: Efficient Convolutional Neural Network Training with Direct Feedback Alignment
Efficient Convolutional Neural Network Training with Direct Feedback Alignment Open
There were many algorithms to substitute the back-propagation (BP) in the deep neural network (DNN) training. However, they could not become popular because their training accuracy and the computational efficiency were worse than BP. One o…
View article: Toward all-day wearable health monitoring: An ultralow-power, reflective organic pulse oximetry sensing patch
Toward all-day wearable health monitoring: An ultralow-power, reflective organic pulse oximetry sensing patch Open
Ultralow-power organic wearable patches have been developed for all-day monitoring of heart rate and blood oxygen level.