Prof. Jun-Bo Yoon’s team selected as ACS Nano 2022 Supplementary cover paper for develpment of highly reliable wireless Hydrogen gas sensor

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TITLE: EE Professor Jun-Bo Yoon’s research team developed a highly sensitive and reliable wireless Hydrogen gas sensor through phase-transition-inhibited Pd nanowires, and is selected as a supplementary cover paper.
 
 
A research team consisting of KAIST’s School of Electrical Engineering Professor Jun-Bo Yoon and Busan National University’s Professor Min-Ho Seo (KAIST Ph.D graduate) has developed a method for wireless and linear Hydrogen detection with high sensitivity, and the paper was accepted to ACS Nano 2022 (Min-Seung Jo as the first author). The research team successfully built a sensor that exhibits high sensing linearity and stable sensitivity over Hydrogen gas concentrations of 0~4% using 3-dimensional Pd nanowire structures that exhibit Pd phase-transition-inhibitions. 
*Phase-transition: physical processes of transition between a state of a medium (such as solid, liquid, and gas phase) used in chemistry and thermodynamics
 
 
The research, led by a Ph.D candidate student Min-Seung Jo as the first author, has been published in a well-known international journal ACS Nano on May 2022. (Paper: Wireless and Linear Hydrogen Detection up to 4% with High Sensitivity through Phase-Transition-Inhibited Pd Nanowires) (https://pubs.acs.org/doi/10.1021/acsnano.2c01783).
 
 
Hydrogen gas has gaining attention as the next generation environmentally friendly energy carrier due to its high combustion energy and the generation of water as the sole byproduct. However, the use of Hydrogen gas requires strict supervision as the gas is flammable and explosive at concentrations above 4% in air.
 
 
Among various Hydrogen gas sensing materials, palladium (Pd) is known to be very appealing not only for its simple mechanism of change in electrical resistance by reacting with the Hydrogen gas, but also very stable as there are no byproducts during the reaction. However, when Pd is exposed to over over 2% H2 concentration, phase transition occurs which results in limitations of concentration range for detection, delay in reaction time, and impairment of durability, and does not meet the basic requirements of being able to detect H2 concentrations of up to 4%.
 
 
To solve this issue, the research team designed and manufactured a new Pd nanostructure in which the chemical potential can be reduced that leads to a lower free energy of phase transition. The new sensor was successfully able to detect H2 concentrations of 0.1~4% with 98.9% linearity. The team also demonstrated a sensor system that wirelessly detects H2 through by incorporating the sensor with BLE (Bluetooth low energy), 3D printing, and an Android application, and it was able to reliably detect H2 leakage with a smartphone or a PC even when located 20 meters away from the sensor. This research is significant in that it was a successful attempt at building a reliable Pd-based H2 sensor that can detect H2 concentrations of over 2%, which was previously difficult to produce. In particular, it is expected that this sensor will be used for safety management in the future where Hydrogen-based clean energy is prevalent. 
 
 
Korean newpapers share this news 28th June.
 
 
[Relate  link]
 
 Et News: https://www.etnews.com/20220628000128 
 News 1: https://www.news1.kr/articles/?4725281
 Energy economics: https://www.ekn.kr/web/view.php?key=20220628010004336
 
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EE Ph.D. Candidate Sangmin Lee and Sungjune Park (Prof. Yong Man Ro) win Ad-hoc Video Search in VBS 2022

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(Prof. Yong Man Ro, Sangmin Lee, Sungjune Park,  from left)

 

Ph.D. Candidate Sangmin Lee and Sungjune Park (Prof. Yong Man Ro’s Lab) won the 1st place in the Ad-hoc Video Search (AVS) section of the 11th Video Browser Showdown (VBS 2022).

 

VBS is the international video retrieval competition held annually, and this year VBS 2022 is the 11th competition.

 

This year’s competition was held at Vietnam Phú Quốc for two days from June 6th to 7th, with 16 finalized video search teams from around the world.

 

The Ad-hoc Video Search section is to find as exact videos for given querys out of 2.5 million videos.

Sangmin Lee and Sungjune Park won the first place by constructing a multimodal search engine based on deep learning, which effectively searches target videos through the multi-modal correspondences of visual-audio-language latent representations.

 

The core algorithm adopted in the search engine, novel visual-audio representation learning method will be presented at CVPR 2022, the top tier conference in computer vision and AI field.

 

The title of the paper is “Weakly Paired Associative Learning for Sound and Image Representations via Bimodal Associative Memory”.

 

– Competition: 11th Video Browser Showdown 2022

– Award: Best AVS (1st place winner in Ad-hoc Video Search)

– Recipient: Sangmin Lee, Sungjune Park, Yong Man Ro (Advisory Professor)

 

EE Prof. Kim, SangHyeon’s team, develops display using 3D integration techniques, promising applications on next generation displays

EE Prof. Kim, SangHyeon’s team, develops display using 3D integration techniques, promising applications on next generation high resolution displays

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[ Prof. Kim, SangHyeon, Ju Hyeok Park (P.H.D candidate), Dr. Dae-myeong Geum, Woo Jin Baek (P.H.D candidate), From left]

 

KAIST EE Prof. Kim, SangHyeon’s research team has successfully developed a 1600-PPI MicroLED display by utilizing monolithic 3D integration techniques, as announced.

(*monolithic 3D integration: dubbed the ultimate 3D integration tech, wherein after the lower-layer devices, the upper layer’s thin film is created and stacking proceeds sequentially so as to maximize the upper-lower device alignment)

(* PPI: pixels per inch)

 

KAIST EE Prof. Kim, SangHyeon Kim’s research team members Ju Hyeok Park and Dr. Dae-myeong Geum led the work as co-first authors, collaborating with Woo Jin Baek from the same research lab and Dr. Johnson Shieh from Jasper Display in Taiwan. Their joint work has been presented at the “semiconductor Olympics”, the 2022 IEEE Symposium on VLSI Technology & Circuits. (Paper: Monolithic 3D sequential integration realizing 1600-PPI red micro-LED display on Si CMOS driver IC)

MicroLED devices using inorganic-based III-V compound semiconductors are gaining attention as core candidates for next-generation ultra-high resolution displays that are growing rapidly in demand. MicroLEDs offer advantages over current OLED and LCD displays widely used in modern TVs and mobile devices with features such as high luminance and contrast ratio, and a longer pixel life.

(*III-V compound semiconductors: Semiconductors comprising of compounds of Group III and Group V elements in the periodic table, offering excellent charge transport and light characteristics)

 

A monolithic 3D integration of red light-emitting LEDs on a Si CMOS circuit board was applied to solve the issues present in existing device technology. A demonstration of high-resolution display was made successful through continuous semiconductor processes on the wafer. Through this process, the LED semiconductor display layer was designed to reduce the thickness of the active layer for light emission to 1/3 and greatly reduce the challenges of the etching process required for pixel formation. In addition, to prevent performance degradation of the lower display driving circuit, the research team was able to maintain the performance of the lower Driver IC even after the integration of the upper layer by using ultra-low temperature processes such as wafer bonding that integrates the upper III-V layer below 350 C.

By successfully implementing state-of-the-art resolution of 1600-PPI MicroLED display using a monolithic 3D integration of red LEDs, this result is expected pave way for the next-generation ultra-high resolution displays.

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EE Professor Kim, SangHyeon’s team develop 3D Stackable Quantum Computing Readout Device

Title:  EE Professor Kim, SangHyeon’s Research Team Develops 3D Stackable Quantum Computing Readout Device

KAIST Builds 3D Stackable Quantum Computing Readout Device  Low-power, low-noise, high-speed device integrated in 3D operates at super-low temperatures and promises large-scale applications to quantum computing devices.

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<(From left) EE Prof. Kim, SangHyeon, PhD candidate Jeong, Jae Yong, NanoFab PhD candidate Kim, Jongmin, and KBSI Prof. Park, Seung-Young>

 

KAIST EE Prof. Kim, SangHyeon’s research team has developed a 3D-stacked semiconductor readout device integration technology, as made public on the 16th. The team made this possible by applying the strengths of monolithic 3D integration to overcome large-scale qubit implementation based on existing quantum computing systems. Their work is a first of its kind exhibiting the 3D stackability of quantum computing readout devices after an actively pursued line of research on monolithic 3D stacking of high-speed devices following a 2021 VLSI presentation, a 2021 IEDM presentation, and a 2022 ACS Nano publication.

(*monolithic 3D integration: dubbed the ultimate 3D integration tech, wherein after the lower-layer devices, the upper layer’s thin film is created and stacking proceeds sequentially so as to maximize the upper-lower device alignment)

KAIST EE Prof. Kim, SangHyeon Kim’s research team member Jeong, Jae Yong led the work as first author, collaborating with NanoFab PhD candidate Kim, Jongmin and KBSI Prof. Park, Seung-Young. Their joint work has been presented at the “semiconductor Olympics”, Symposium on VLSI Technology. (Paper: 3D stackable cryogenic InGaAs HEMTs for heterogeneous and monolithic 3D integrated highly scalable quantum computing system)

A qubit is capable of processing twice the amount computation compared with that of a bit. Number of qubits increasing linearly results in exponential speedup of their computation. Thus, developing large-scale quantum computing is of utmost importance. IBM, for instance, presented Eagle containing 127 qubits, and the IBM roadmap outlines development of a 4,000-qubit quantum computer by 2025 and one with 10,000-qubits or more in 10 years.

Designing such large-scale quantum computers with many qubits requires implementing devices for qubit control/readout. The research team has not only proposed and implemented 3D-stacked control/readout devices but also achieved world-best cutoff frequency characteristics at cryogenic settings despite the 3D stacking.

This work has been supported by the National Research Foundation of Korea, the System Semiconductor Development Program funded by Gyeonggi-do, and the Korea Basic Science Institute.

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EE Prof. Kim, Changick and Jeong, Jae-Woong Awarded on KAIST Research Day

 EE Professors Kim, Changick and Jeong, Jae-Woong Awarded on 2022 KAIST Research Day.

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[From left, Prof. Kim, Changick, Prof. Jeong, Jae-Woong]

 

Professor Kim, Changick has been recognized with the Transdisciplinary Research Prize for his contributions to computer vision- and artificial intelligence-based monitoring  technology of anthropocene effects on the planet. Anthropocene is a scientific concept referring to the recent geological epoch distinct from previous ones, marked by unprecedented transformations in the planet’s system from human activities since the Industrial Revolution. Prof. Kim has been conducting research with satellite images, computer modeling, and deep learning tools on monitoring the compromised states of planet Earth, such as climate change and sea level rises. In addition, as part of AI-based digital study of ecology, he has cooperated closely with anthropogeography and ecology experts to detect endangered species in the DMZ; he has developed a deep network capable of counting and classifying endangered species, such as the red-crowned cranes, the white-naped cranes, and the white-fronted geese. This study is meaningful in automating and maintaining the monitoring process of endangered species in the DMZ and Cheorwon.

 

Professor Jeong, Jae-Woong has been awarded the KAIST Scholastic Award for proposing a new direction in the automated treatment of brain diseases and cognitive research by developing for the first time an IoT (Internet of Things) based wireless remote control system for neural circuits in the brain. The proposed direction sets a vision for one of humanity’s most difficult challenges: overcoming brain diseases. Prof. Jeong has also led the field of research in wirelessly rechargeable soft subdermal implantable devices. These works have been published in 2021 in top journals of medical engineering: Nature Biomedical Engineering and Nature Communications. Said studies were led by Prof. Jeong’s team, with international collaborators in Washington University in School of Medicine, attracting over 60 press reports across the world.

 

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Professor Song, lickho has published a book on probability and random variables in English

Professor Song, lickho has published a book on probability and random variables in English.
The book is a translated version of Prof. Song’s book ‘Theory of Random Variables’ in Korean, which was selected as an ‘Excellent Book of Basic Sciences’ by the National Academy of Sciences and the Ministry of Education in 2020.
 
 
 
You can find more information on the book below:
 
Title: Probability and Random Variables: Theory and Applications
Authors:  Iickho Song,  So Ryoung Park,  Seokho Yoon
 
Summary:
This book discusses diverse concepts and notions – and their applications – concerning probability and random variables at the intermediate to advanced level. It explains basic concepts and results in a clearer and more complete manner than the extant literature. In addition to a range of concepts and notions concerning probability and random variables, the coverage includes a number of key advanced concepts in mathematics. Readers will also find unique results on e.g. the explicit general formula of joint moments and the expected values of nonlinear functions for normal random vectors. In addition, interesting applications of the step and impulse functions in discussions on random vectors are presented. Thanks to a wealth of examples and a total of 330 practice problems of varying difficulty, readers will have the opportunity to significantly expand their knowledge and skills. The book is rounded out by an extensive index, allowing readers to quickly and easily find what they are looking for.
Given its scope, the book will appeal to all readers with a basic grasp of probability and random variables who are looking to go one step further. It also offers a valuable reference guide for experienced scholars and professionals, helping them review and refine their expertise.
 
Link:   https://link.springer.com/book/10.1007/978-3-030-97679-8

EE Prof. Hyun Myung’s Team wins the 2nd Prize among Academia in IEEE ICRA 2022 SLAM Challenge

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[Hyungtae Lim (PhD student), event officials, Prof. Hyun Myung, from the left)

Title: EE Prof. Hyun Myung’s Team wins the 2nd Prize in Academia at the Future of Construction Workshop in IEEE ICRA 2022  
 
Team QAIST (advisor: Prof. Hyun Myung) wins the 2nd prize at HILTI Challenge 2022 held in Future of Construction: Build Faster, Better, Safer – Together with Robots Workshop at 2022 IEEE International Conference on Robotics and Automation (ICRA) held in Philadelphia, USA during May 23-27, 2022.  
HILTI SLAM Challenge 2022 is  organized by HILTI Corp. in Liechtenstein, Oxford Robotics Institute in Oxford University, and Robotics and Perception Group in ETH Zürich.  
This Challenge is a competition for accurate mapping by developing simultaneous localization and mapping (SLAM) algorithms that can robustly operate even in construction environments and degeneracy environments such as narrow indoor environments that lack features. Among the  40 teams around the world, team QAIST wins the 2nd prize in the Academia. They will receive  USD 3,000 as a cash prize.  
   
Details on this good news are as follows:   
 

l  Name of Conference: 2022 IEEE International Conference on Robotics and Automation (ICRA) 

l  Name of Workshop and Date: Future of Construction: Build Faster, Better, Safer – Together with Robots Workshop, 23rd, May, 2022 

l  Prize: 2nd Prize among Academia (USD 3,000) 

l  Participants: Team QAIST (Quatro + KAIST). Hyungtae Lim, Daeboem Kim, Beomsoo Kim, Seungwon Song, Alex Junho Lee, Seungjae Lee, and Prof. Hyun Myung 

P.h.D. Candidate Gong, Jinu (Prof. Kang, Joonhyuk(Head, School of EE)) Wins IEEE DSLW Best Student Paper Runner-up Award

[(from the left) Professor Kang Joonhyuk, Gong Jinu (Ph.D candidate)]

PhD candidate Gong, Jinu from EE Professor Kang, Joonhyuk’s lab won the Best Student Paper Runner-up Award at the 2022 IEEE Data Science and Learning Workshop. He has been chosen to receive the award for the contribution made in the presented paper “Forget-SVGD: Particle-Based Bayesian Federated Unlearning”.
 
 
Details on this good news are as follows:
 
 
Venue: 2022 IEEE Data Science and Learning Workshop
 
Date: May 22 ~ 23, 2022
 
Award: The Best Student Paper Runner-up Award
 
Authors: Jinu Gong, Osvaldo Simeone*, Rahif Kassab*, and Joonhyuk Kang
                                 (*King’s College London)
 
Paper: Forget-SVGD: Particle-Based Bayesian Federated Unlearning
 
 
 
 
COVID-19 precautions rendered this year’s conference online. The DLSW, a successor to the IEEE Data Science Workshop, has been held since 2021 by IEEE to encompass signal processing, statistics, machine learning, data mining, and computer vision as an international academic venue. (acceptance rate: 26.7%)

CVPR 2022 Oral Presentation from Professor Chang D. Yoo’s Lab, SoftGroup for 3D Instance Segmentation on Point Clouds

Title of the paper: SoftGroup for 3D Instance Segmentation on Point Clouds

Conference: The IEEE / CVF Computer Vision and Pattern Recognition Conference (CVPR) 2022

Date & Location: June 21, 2022 (Tue) / New Orleans, Louisiana, USA

 

CVPR2022학부홍보

[(from the left) Professor Chang D. Yoo, Vu Van Thang (Ph.D candidate), Kookhoi Kim (Master’s candidate)]

 

3D datasets are being utilized in various fields recently such as autonomous driving, robotics, and AR. 3D point clouds are data comprised of sets of 3D points and this study developed SoftGroup, a precision object segmentation technology based on 3D point cloud. SoftGroup allows each point to be associated with multiple classes to mitigate problems stemming from semantic prediction errors and surpasses prior state-of-the-art methods by more than 8% in terms of performance. Allowing for 3D instance segmentation of point clouds that contain more precise information of 3D space compared to traditional photographs, SoftGroup shows high potential for utilization in fields that leverage 3D point clouds.

 

softgroup example cropped

 

PH.D. Zhiyong Li (Prof. Hoi-Jun Yoo),win Outstanding Student Design Award on 22 IEEE CICC

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[Award ceremony picture, Li Zhiyong, left side]

KAIST EE Ph.D. student Zhiyong Li (Advised by Prof. Hoi-Jun Yoo) won the Outstanding Student Design Award at the 2022 IEEE Custom Integrated Circuits Conference (CICC). The conference was held in California, U.S. from April 24th to 27th. CICC is an international conference held annually by IEEE. Ph.D. student Zhiyong Li has published a paper titled “An 0.92mJ/frame High-quality FHD Super-resolution Mobile Accelerator SoC with Hybrid-precision and Energy-efficient Cache”.

Details are as follows. Congratulations once again to Ph.D. student Zhiyong Li and Professor Hoi-Jun Yoo!

Conference: 2022 IEEE Custom Integrated Circuits Conference (CICC)

Date: April 24-27, 2022

Award: Intel & Analog Devices Outstanding Student Paper Award

Authors: Zhiyong Li, Sangjin Kim, Dongseok Im, Donghyeon Han, and Hoi-Jun Yoo (Advisory Professor)

Paper Title: An 0.92mJ/frame High-quality FHD Super-resolution Mobile Accelerator SoC with Hybrid-precision and Energy-efficient Cache