EE Professor Kyeongha Kwon’s Research Team Develops a Battery-less Wireless Implant for Real-time Diagnosing Cardiovascular Function

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•    Development of a wireless system for real-time measurement of pressure, blood flow, and temperature inside blood vessels
•    Widely expected to be used for predicting and managing preoperative risks for cardiovascular disease patients
 
Real-time hemodynamic monitoring helps manage patients with cardiovascular disease before and after surgery. As a result, demand is increasing for wireless, implantable medical technology that can provide real-time measurement of pressure, flow, and temperature inside blood vessels in daily life.
 
Professor Kwon has developed a wireless cardiovascular implant that diagnoses cardiovascular function by measuring pressure, flow, and temperature inside blood vessels in real time without a battery.
This technology, developed through joint research with Dr. Kim Jong-wook of Northwestern University in the United States, was announced on April 11th in the international academic journal Nature Biomedical Engineering (paper title: A battery-less wireless implant for the continuous monitoring of vascular pressure, flow rate and temperature; URL: https://www.nature.com/articles/s41551-023-01022-4).
 
Currently, the sensor is inserted into an artery with a wired tether connected to a bed monitor, making it possible to measure arterial pressure and blood flow velocity.
 
However, wired interfaces can damage blood vessels and infection or cause a decrease in measurement accuracy, so they are limited to use in non-moving patients in hospitals.
The critical challenge is to develop an implant system that operates wirelessly without a battery, to support postoperative monitoring of patients anywhere and at any time without requiring access to specialized medical facilities.
 
Professor Kwon Kyeongha, who led the research, said, “We expect this technology to be used in various clinical fields such as slope and leakage tests after transcatheter aortic valve implantation (TAVI), pressure and flow rate measurements inside flow diverters for cerebral aneurysms, and endoscopic surgeries for thoracic aortic aneurysms (TEVAR) and abdominal aortic aneurysms (EVAR) – endoluminal monitoring, among others.”
 
 
[Professor Kwon Kyeongha and Dr. Kim Jongwook of Northwestern University from left] 
 
 
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EE Ph.D. candidate Simok Lee (Prof. Jae-Woong Jeong) wins Best Poster Award at the 2023 MRS Spring Meeting

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[Prof. Jae-Woong Jeong, Ph.D. Candidate Simok Lee from left]

 

Ph.D. student Simok Lee (Advised by Jae-Woong Jeong) won the Best Poster Award at the 2023 MRS Spring Meeting.

The MRS Meeting is a global conference organized by the Materials Research Society, one of the largest materials societies in the world.

The meeting brings together top researchers from more than 80 countries to present the latest findings in the field of materials, including physics, chemistry, and biology.

The 2023 MRS Spring Meeting was held from April 10-14 in San Francisco, USA, with approximately 5500 attendees and 1382 posters presented, 18 of which won the Best Poster Award.

Ph.D. student Simok Lee presented a poster titled “Adaptive Electronic Skin with High Sensitivity and Large Bandwidth Based on Gallium Microdroplet-Elastomer Composite”. 

 

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[Awards Ceremony, MRS Meeting Chair Prof. Tae-woo Lee, Ph.D. Candidate Simok Lee, Prof. Jae-Woong Jeong from left]

 

 

Professors Junil Choi and Hyun Myung named IEEE VTS Distinguished Lecturers

Professor  Joonil Choi and Hyun Myung have been selected as ‘Distinguished Lecturer’ by the Vehicular Technology Society (VTS) of the Institute of Electrical and Electronics Engineers (IEEE) and will serve as ‘Distinguished Lecturers’ for two years until 2025. 

IEEE VTS is the world’s largest academic society in the electronic engineering related to moving objects. VTS selects some researchers over the world who leads the field, and selects them as ‘Distinguished Lecturer’ to give the opportunity to give a lecture to over 90 chapters over the world. Through this opportunity, students of the academy can learn about current research trend and result, along with the chance to directly communicate with the distinguished lecturers.

Professor Joonil Choi, whose research is based on next-generation wireless communication technology, will present ‘Communication System Using Machine Learning”. Hyun Myung, whose research is based on robot autonomous driving, will present ‘Robot Autonmous Drivings: Core Technologies and Applications’. 

Once again, congratulations and thanks for being selected as IEEE VTS Distinguished Lecturer.

 

교수

Prof. Myung, Hyun’s research team develops ‘Dreamwalker’ technology that walks up stairs without seeing

1. 연구팀이 개발한 제어기 드림워크의 개요도

 

– Developed ‘Dreamwalk’, a walking robot control technology based on artificial intelligence deep reinforcement learning that can walk in atypical environments without visual and tactile information.
– Mass production of various types of quadrupedal ‘Dreamwalker’ robots using ‘Dreamwalk’ technology
– Expected to be utilized for exploration missions in atypical environments caused by disasters such as fires
 
A quadrupedal robot technology that can go up and down stairs and move without falling in uneven environments such as tree roots without the help of visual or tactile sensors in smoky disaster situations has been developed by domestic researchers.
 
A research team led by Professor Myung, Hyun of the Department of Electrical and Electronic Engineering, Urban Robotics Laboratory, has developed a walking robot control technology that enables robust ‘blind locomotion’ in various unstructured environments.
 
The team has developed a technology called “DreamWaQ,” which is named for its ability to walk blindly, just as a person can wake up from sleep and walk to the bathroom in the dark with little visual assistance, and the robot equipped with this technology is called a “DreamWaQer.”
This technology can be used to create various types of quadrupedal robot DreamWalkers.
 
In addition to the laboratory environment, the DreamWaQer robot has demonstrated robust performance in a university campus environment with curbs and speed bumps, and in a field environment with tree roots and gravel, by overcoming steps of up to two-thirds of its height from the ground to its body when walking.
The team also found that the robot can walk stably at speeds as slow as 0.3 m/s and as fast as 1.0 m/s, regardless of the environment.  
 
The results of the study, which was led by Doctoral Candidate I Made Aswin Nahrendra and co-authored by Doctoral Candidate Byung Ho Yoo, have been accepted and will be presented at the IEEE International Conference on Robotics and Automation (ICRA), the world’s most prestigious conference on robotics, in London, UK, at the end of May. (Paper title: DreamWaQ: Learning Robust Quadrupedal Locomotion With Implicit Terrain Imagination via Deep Reinforcement Learning)
 
Videos of DreamWalker, a walking robot equipped with the developed DreamWaQ, can be viewed at the following addresses.
 
 
-Main video: https://youtu.be/JC1_bnTxPiQ
 
-Cookie video:  https://youtu.be/mhUUZVbeDA0 
 
1. 왼쪽부터 전기및전자공학부 명현 교수 이 마데 아스윈 나렌드라I Made Aswin Nahrendra 박사과정 유병
(From left) Prof. Myung, Hyun, Doctoral Candidate I Made Aswin Nahrendra, Doctoral Candidate  Byung Ho Yoo, and Doctoral Candidate  Min Ho Oh. In the foreground, Dreamwalker, a quadrupedal robot equipped with Dreamwalk technology.
 
 
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Professor Sanghyeon Kim’s team enables ultra-high resolution micro LED technology with 40% lower heat generation

KAIST  enables ultra-high resolution micro LED technology with 40% lower heat generation

 

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– Demonstrates that epitaxial structure modification technology can fundamentally solve the problem of device efficiency degradation, and is expected to contribute significantly to the commercialization of ultra-high resolution micro LED displays.

 

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[Professor Sanghyeon Kim, Doctoral Candidate Woo Jin Baek]
 
A team of researchers led by Professor Sanghyeon Kim has rediscovered the phenomenon that the efficiency of micro LEDs decreases when the device size is miniaturized to the size of a micrometer (μm, one millionth of a meter), and has shown that it can be fundamentally solved by changing the epitaxial structure.
 
Epitaxy technology is a process in which ultra-pure silicon or sapphire substrates, which are used as micro LEDs, are used as a medium and gallium nitride crystals, which are used as light emitters, are stacked on top of them.
 
Micro LEDs are being actively researched for their superior brightness, contrast, and lifespan compared to OLEDs, and Samsung Electronics commercialized a product with micro LEDs called “The Wall” in 2018, and Apple is expected to commercialize a product with micro LEDs in 2025.
 
To produce micro LEDs, the epitaxial structure grown on the wafer is cut into the shape of a cylinder or cuboid through an etching process to form pixels, which involves a plasma-based process.
 
However, these plasmas create defects on the sides of the pixels during the pixel formation process, and as the pixel size decreases and the resolution increases, the ratio of the surface area to the volume of the pixel increases, so the device side defects that occur during the process reduce the device efficiency of micro LEDs to a greater extent.
 
While much research has been focused on mitigating or eliminating side defects, these methods are limited by the fact that they require a post-processing step after the epitaxial structure is grown.
 
The researchers found that the current flowing through the sidewalls of micro-LEDs varies depending on the epitaxial structure during the operation of the micro-LED device, and based on this, they designed a structure that is insensitive to sidewall defects, solving the problem of decreasing efficiency as micro-LED devices miniaturize.
 
In addition, the proposed structure can reduce the heat generated when driving the display by about 40% compared to the existing one, which is significant for the commercialization of ultra-high resolution micro LED displays.
 
“This technology development has great significance in identifying the cause of efficiency decline, which has been a barrier to miniaturization of microLEDs, and solving it by designing an epitaxial structure, and is expected to be used for ultra-high resolution displays in the future,” said Professor Kim Sanghyeon.
 
 
 

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Professor Yongdae Kim’s team develops a proprietary Technology for Detection of Voice Phishing SIM Boxes

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– Professor Yongdae Kim’s team develops a detection technology to distinguish benign mobile phones and SIM boxes used for malicious voice phishing over LTE.
– This technology differentiates between the SIM boxes and mobile devices based on the unique characteristics of each mobile device.
– It is necessary to implement a SIM box registration system, which is expected to effectively block voice phishing crimes in the future.
 
 
1. KAIST 전기및전자공학부 김용대 교수
[Professor Yongdae Kim]
 
 
If SIM boxes are exploited for voice phishing, it is possible that internet calls from overseas can be used to manipulate the calling number to be recognized as a number coming from within Korea. Professor Yongdae Kim’s team from the School of Electrical Engineering has developed proprietary technology which identifies SIM boxes used for voice phishing by mobile carriers. All devices, including mobile phones, transmit the features that they can support when connecting to a mobile communication network. Professor Yongdae Kim’s team proposed a method of distinguishing mobile devices using around 1,000 of such features and was able to classify models of around 100 mobile devices. They also confirmed that this technology can clearly distinguish between SIM boxes and benign mobile phones.
 
Beomseok Oh, a researcher at KAIST and the co-first author of this research, said, “We confirmed that the mobile phones and SIM boxes can clearly be distinguished using over 100 mobile devices.” He added, “to apply this technology in real life, we need to collaborate with the mobile carriers for verification using commercial data and further technological advancement.”
 
Professor Yongdae Kim said, “there also exist legitimate use of SIM boxes, which means that it is important for mobile carriers to not only detect SIM boxes, but to identify those that are being used in a malicious manner.” He further explained, “to effectively apply this technology, a SIM box registration system is needed. SIM boxes used for legitimate purposes can be registered as such, while unregistered SIM boxes can be identified as being illegally used.”
 

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Professor Hoi-Jun Yoo is Recognized as a Leading Contributor of Semiconductor Design at ISSCC

Professor Hoi-Jun Yoo is Recognized as a Leading Contributor of Semiconductor Design at ISSCC

 

– Selected as the only Asian out of the top 5 contributors at the 70th anniversary ceremony of the International Solid-State Circuits Conference (ISSCC)

– Undertaking active research for the advancement of Korean memory industry and system semiconductor technology, including the development of artificial intelligence semiconductors (AI semiconductors)

 

images 000059 photo2.jpg images 000059 photo3.png

[Professor Hoi-Jun Yoo receives the ISSCC Author-Recognition Award (left) and the Author-Recognition Award plaque (right)]

 

Professor Hoi-Jun Yoo has been recognized as one of the top 5 leading contributors with more than 63 presented papers, and is the only Asian to be selected as such. Professor Yoo developed the world’s first 256M SDRAM at Hyundai Electronics (now SK Hynix) 41 years after the establishment of ISSCC, and published his achievements at the same conference, becoming the first Korean scholar to do so.

Professor Yoo’s research team has since then moved to KAIST and has published 62 papers from 2000 to 2023, leading to a combined total of 63 papers published at the conference. “DRAM Design”, a book written by Professor Yoo in 1996, was selected as must-read book for Samsung Electronics and Hynix engineers.

In addition, Professor Yoo presented five papers on DRAM-related semiconductors, 26 papers on semiconductors for biomedical and low-power wireless communication chips, and 14 papers on wearable semiconductors for augmented reality (AR). In particular, Professor Yoo started his research on artificial intelligence (AI) semiconductors since 2008 and has presented a total of 18 papers related to this field, including work on the world’s first DNN accelerator in 2014.

In addition, he was the first Asian professor to be invited as an ISSCC keynote speaker related to AI semiconductors in 2019. This year marks the 75th anniversary of the invention of the transistor with 10 leading speakers were selected from the Institute of Electrical and Electronics Engineers (IEEE) Electron Devices Society/Solid-State Circuits Society (EDS/SSCS) to commemorate this historical moment, and Professor Yoo was selected as one of them.

In addition, this year marks the 60th anniversary of the invention of MOSFET which is a critical component of semiconductor manufacturing, and Professor Yoo was awarded the Dawon Kahng Award in honor of Dr.Dawon Kahng, the inventor of MOSFET, at the Korean Conference on Semiconductors on February 14 of this year.

 

Professor Hyunchul Shim’s Research Team Signs Autonomous Driving Partnership with Hyundai Motors

EE Professor Hyunchul Shim’s research team has entered into a partnership agreement with Hyundai Motors on February 23rd for “High-Speed Autonomous Driving Technology Research.”

Under this agreement, Hyundai Motors will provide research funding to KAIST, while KAIST will share specialized knowledge and experience related to high-speed autonomous driving technology, and provide cooperation in promotion. 

 

The signing ceremony took place at Rolling Hills Hotel in Hwaseong, Gyeonggi Province, and was attended by key personnel, including Naksup Sung, Executive of Hyundai Motors, and Professor Hyunchul Shim and his research team from KAIST. 

 

Naksup Sung, the head of Hyundai Motors’ Research and Development Management Planning Division, said, “We expect that research on high-speed autonomous driving based on this partnership will not only improve the safety and performance of high-speed vehicles but also general autonomous driving vehicles.” He added, “We will support KAIST Professor Shim’s team, the first to step up to the global stage in this field within Asia, despite many difficulties.” 

 

Professor Shim said, “It is an honor to receive support from Hyundai Motors, who has been making efforts to expand domestic autonomous driving technology through continuous support for domestic competitions and research at various universities since 2010.” He added, “I expect that we will achieve even better results at competitions to be held in Italy and the United States with the support of this partnership.”

 

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– KAIST Racing Team participating in the Indy Autonomous Challenge @ CES 2023 (Team Leader: Sungwon Na, Team Members: Seongwoo Moon, Hyunwoo Nam, Chanhoe Ryu, Jaeyoung Kang)

 

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– Nine teams that competed at the first Indy Autonomous Challenge on October 23, 2021. (KAIST team is the right most team in the front row) 

 

 

 

 

Electrical Engineering won the 29th SAMSUNG Human Tech Paper Award

Our department was selected as ‘the most award-winning department in the university sector’ at the Human Tech Thesis Awards this year as well.
 
The 29th Human Tech Thesis Award is hosted by Samsung Electronics and has been selected since 1994 to discover outstanding human resources in the field of science and technology.
In addition to individual prizes awarded to individual winners, the Human Tech Thesis Awards award special prizes to universities and high schools (levels) that have shown outstanding achievements.
 
Department that is selected as ‘the most award-winning department in the university sector’ receive a prize of 10 million won.
Every year, our department is selected as the most award-winning department, and nine award-winning papers, including the gold award, were selected this year.
 

Details are as below.

 

분과 수상 주저자 공저자1 공저자2 공저자3 지도교수 논문제목
Circuit Design 금상 양제 김재영 임석빈 이석진 김주영 JNPU: A 1.04 TFLOPS Joint-DNN Training Processor with Speculative Quantization and Triple Heterogeneity
Circuit Design 은상 김상진 이지용 엄소연 조우영 유회준 DynaPlasia: An eDRAM In-Memory Computing-based Reconfigurable Spatial Accelerator with Triple-mode Cell
Circuit Design 동상 이민수 채종윤     문건우 A PWM Resonant Converter with Near-Zero-Ripple Input Current and High Efficiency for Fuel Cell Applications
Circuit Design 동상 한동현 류준하 김상엽 김상진 유회준 MetaVRain: A 133mW Real-time Hyper-realistic 3D NeRF Processor with 1D-2D Hybrid Neural Engines for Metaverse on Mobile Devices
Communication & Networks 은상 김재홍 이윤헌 임휘준 정영목 한동수 Co-optimizing for Flow Completion Time in Radio Access Network
Communication & Networks 동상 김재한 유명성     신승원 Heimdallr: Fingerprinting SD-WAN Control-Plane Architecture via Encrypted Control Traffic
Computer Science & Engineering 은상 김태현       박경수 Rearchitecting the TCP Stack for I/O-Offloaded Content Delivery
Physical Devices & Processes 동상 이용복 김태수 이소영   윤준보 Sub-10 fJ/bit Radiation-hard Nanoelectromechanical Non-volatile Memory
Signal Processing 장려상 신욱철 이경현     권인소 Spectral-Invariant Monocular Depth Estimation 

Professor Hoi-Jun Yoo and Byung-Jin Cho won the Daewon Kahng Award

5

[Professor Hoi-Jun Yoo and Byung-Jin Cho from left]
 
 

Professor Hoi-Jun Yoo is a world-renowned expert in the field of semiconductor and developed the world’s first 256-mega SD RAM, successfully laying the foundation of AI semiconductor.

He contributed to the development of intelligent visual processors, neural network processing units (NPUs), and neuromorphic processors before deep neural network (DNN) started to gain attention. He specifically applied a neuron network-like network to intelligent visual processors to reduce power consumption, dramatically improving the energy efficiency and computation performance.

He also developed DNN-based NPU that is essential for object recognition and natural language processing and thus revolutionized the market for low-power AI semiconductor. Professor Hoi-Jun Yoo was the first Asian to give a keynote speech at the International Solid State Circuit Society (ISSCC) in 2019 in recognition of his research achievements.

In addition, the ‘PIM Semiconductor Design Research Center’ was established last year to lead the development of processing-in-memory (PIM) technology through the cooperation with companies and academia.

 

Professor Byung-Jin Cho discovered the semiconductor soft-breakdown (SBD) phenomenon for the first time and revealed its mechanism. Soft breakdown is an insulation breakdown phenomenon in which leakage current flows through a semiconductor gate insulating film and adversely affects the function of the gate insulating film and semiconductor.

Professor Byung-Jin Cho is a world-renowned authority in the field of High dielectric substrates, whose demand is increasing as the materials are replacing the silicon oxide insulating films.

Professor Byung-Jin Cho contributed to the development of semiconductor by applying the high dielectric substrates to charge trap-type memory for the first time. Along with SK Hynix and Jusung Engineering, he also contributed to the development of DRAM products that are equipped with high dielectric. He has published more than 600 papers in the field of semiconductor.

 

Dr. Daewon Kahng developed for the first time ‘MOSFET (Metal Oxide Film Semiconductor Field Effect Transistor)’, which has been established as the standard in semiconductor transistors. He contributed to the miniaturization of semiconductor transistors and mass production. Furthermore, he participated in the development of floating gates, a core technology for NAND flash memory.