KUSTAR
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Highly Uniform and Low Hysteresis Pressure Sensor to Increase Practical Applicability
< Professor Steve Park (left) and the First Author Mr. Jinwon Oh (right) >
Researchers have designed a flexible pressure sensor that is expected to have a much wider applicability. A KAIST research team fabricated a piezoresistive pressure sensor of high uniformity with low hysteresis by chemically grafting a conductive polymer onto a porous elastomer template.
The team discovered that the uniformity of pore size and shape is directly related to the uniformity of the sensor. The team noted that by increasing pore size and shape variability, the variability of the sensor characteristics also increases.
Researchers led by Professor Steve Park from the Department of Materials Science and Engineering confirmed that compared to other sensors composed of randomly sized and shaped pores, which had a coefficient of variation in relative resistance change of 69.65%, their newly developed sensor exhibited much higher uniformity with a coefficient of variation of 2.43%. This study was reported in Small as the cover article on August 16.
Flexible pressure sensors have been actively researched and widely applied in electronic equipment such as touch screens, robots, wearable healthcare devices, electronic skin, and human-machine interfaces. In particular, piezoresistive pressure sensors based on elastomer‐conductive material composites hold significant potential due to their many advantages including a simple and low-cost fabrication process.
Various research results have been reported for ways to improve the performance of piezoresistive pressure sensors, most of which have been focused on increasing the sensitivity. Despite its significance, maximizing the sensitivity of composite-based piezoresistive pressure sensors is not necessary for many applications. On the other hand, sensor-to-sensor uniformity and hysteresis are two properties that are of critical importance to realize any application.
The importance of sensor-to-sensor uniformity is obvious. If the sensors manufactured under the same conditions have different properties, measurement reliability is compromised, and therefore the sensor cannot be used in a practical setting.
In addition, low hysteresis is also essential for improved measurement reliability. Hysteresis is a phenomenon in which the electrical readings differ depending on how fast or slow the sensor is being pressed, whether pressure is being released or applied, and how long and to what degree the sensor has been pressed. When a sensor has high hysteresis, the electrical readings will differ even under the same pressure, making the measurements unreliable.
Researchers said they observed a negligible hysteresis degree which was only 2%. This was attributed to the strong chemical bonding between the conductive polymer and the elastomer template, which prevents their relative sliding and displacement, and the porosity of the elastomer that enhances elastic behavior.
“This technology brings forth insight into how to address the two critical issues in pressure sensors: uniformity and hysteresis. We expect our technology to play an important role in increasing practical applications and the commercialization of pressure sensors in the near future,” said Professor Park.
This work was conducted as part of the KAIST‐funded Global Singularity Research Program for 2019, and also supported by the KUSTAR‐KAIST Institute.
Figure 1. Image of a porous elastomer template with uniform pore size and shape (left), Graph showing high uniformity in the sensors’ performance (right).
Figure 2. Hysteresis loops of the sensor at different pressure levels (left), and after a different number of cycles (right).
Figure 3. The cover page of Small Journal, Volume 15, Issue 33.
Publication:
Jinwon Oh, Jin‐Oh Kim, Yunjoo Kim, Han Byul Choi, Jun Chang Yang, Serin Lee, Mikhail Pyatykh, Jung Kim, Joo Yong Sim, and Steve Park. 2019. Highly Uniform and Low Hysteresis Piezoresistive Pressure Sensors Based on Chemical Grafting of Polypyrrole on Elastomer Template with Uniform Pore Size. Small. Wiley-VCH Verlag GmbH & Co. KgaA, Weinheim, Germany, Volume No. 15, Issue No. 33, Full Paper No. 201901744, 8 pages. https://doi.org/10.1002/smll.201901744
Profile: Prof. Steve Park, MS, PhD
stevepark@kaist.ac.kr
http://steveparklab.kaist.ac.kr/
Assistant Professor
Organic and Nano Electronics Laboratory
Department of Materials Science and Engineering
Korea Advanced Institute of Science and Technology (KAIST)
http://kaist.ac.kr
Daejeon 34141, Korea
Profile: Mr. Jinwon Oh, MS
jwoh1701@gmail.com
http://steveparklab.kaist.ac.kr/
Researcher
Organic and Nano Electronics Laboratory
Department of Materials Science and Engineering
Korea Advanced Institute of Science and Technology (KAIST)
http://kaist.ac.kr Daejeon 34141, Korea
Profile: Prof. Jung Kim, MS, PhD
jungkim@kaist.ac.kr
http://medev.kaist.ac.kr/
Professor
Biorobotics Laboratory
Department of Mechanical Engineering
Korea Advanced Institute of Science and Technology (KAIST)
http://kaist.ac.kr Daejeon 34141, Korea
Profile: Joo Yong Sim, PhD
jsim@etri.re.kr
Researcher
Bio-Medical IT Convergence Research Department
Electronics and Telecommunications Research Institute (ETRI)
https://www.etri.re.krDaejeon 34129, Korea
(END)
2019.08.19 View 25696 -
KAIST-KU Sign MOU on 4th Industrial Technology Development
(President Shin(second from left) poses with Khalifa University President Tod Laursen after signing an MOU in the UAE on March 25. Far left is Chairman of the NST Kwangyun Wohn and far right is the UAE Minister of Educatiion Hussain Al Hammadi.)
KAIST President Sung-Chul Shin and Khalifa University Interim President Tod Laursen signed an MOU on the Fourth Industrial Technology Development on March 25 in the UAE.
They signed the MOU during the UAE-ROK Nuclear Friendship and KAIST Alumni Night at Khalifa University co-hosted by KAIST and the Korea Atomic Energy Research Institute (KAERI). The MOU will bring new opportunities to further expand bilateral cooperation in education and training in the relevant technologies called for the era of the Fourth Industrial Revolution.
More than 100 dignitaries including Chairman of National Research Council of Science and Technology (NST) in Korea Dr. Kwangyun Wohn, President of KAERI Jaejoo Ha, the UAE Minister of Education His Excellency Hussain Al Hammadi, Minister of State for Advanced Sciences Her Excellency Sarah bint Yousef Al Amiri, and His Excellency Federal Authority for Nuclear Regulation (FANR) Director General Christopher Viktorsson attended the event. In particular, a significant number of Emirati graduates of the KUSTAR-KAIST education program and many others who completed various KAIST training programs joined the event.
The Nuclear Friendship Night was celebrating the completion of the first nuclear power plant in Barakah exported by Korea. This is the first nuclear reactor in the Middle East, which is to start operation later this year. The event also coincided with Korean President Moon Jae-In’s state visit to the UAE.
KAIST and KAERI gathered distinguished leaders from the higher education and nuclear industries at the event in response to the UAE government’s top national agenda of fostering future talents and promoting the nuclear industry in order to ensure energy security.
KAIST and Khalifa University signed an initial agreement in education and research in 2009 when the governments of Korea and the UAE signed a contract to build four nuclear power plants in Barakah. Since then, the two universities have worked together closely in the areas of nuclear engineering, bio-medical engineering, robotics, mechanical engineering, chemical engineering, and materials science. With this signing on the new MOU, the partnership between the two institutions will mark the second phase of educating high-caliber human resources in science and technology of the two countries.
The KAIST Alumni Night also brought more opportunities to appreciate the achievements that the two countries have made through collaboration in education and research, mostly represented in the field of nuclear technology between KAIST and Khalifa University. During the event, KAIST graduates also shared their experiences from the education at KAIST, followed by the welcoming speeches from the UAE Minister of Education and the UAE Minister of State for Advanced Sciences.
KAIST President Shin, in his welcoming speech at the event, said, “I look forward to more students in the UAE having the opportunity to experience the world’s top-level education and global environment that KAIST offers. The collaboration with Khalifa University and the UAE is very important for building both countries’ future growth.”
KU President Laursen said, “This MOU on research cooperation focusing on technologies for the Fourth Industrial Revolution, nuclear engineering, and other technical areas will further consolidate our partnership with KAIST and support us in developing human capital suitable to take on future challenges in the science and technology sectors. We firmly believe the talent pool of experts created by this initiative will contribute to the overall economic growth of the UAE.”
2018.03.26 View 8625 -
KAIST-Saudi Nuclear Workforce Training
Nuclear Engineering Intensive Course Program Held in Saudi Arabia from January 5th to 23rd
KUSTAR (The Khalifa University of Science and Technology Studies)-KAIST Institute of Education began its Nuclear Engineering Intensive Course Program on 5th January with researchers from K.A.CARE (King Abdullah City for Atomic and Renewable Energy) of Riyadh, Saudi Arabia.
This program, which was lasted until 23rd January, provided education to students on the basic technologies in the field of nuclear power.
The course involves a wide range of lectures, such as basic nuclear physics, applications using radiation, nuclear reactor design and safety, as well as nuclear power engineering.
In order to utilize the nuclear power and renewable energy, K.A.CARE was established in April 2010. The institution is also involved in the construction of nuclear infrastructure, including the site investigations, the establishment of regulatory bodies and state-owned nuclear companies, along with the newly launched workforce-training program.
The Director of the KUSTAR-KAIST Education Research Institute, Professor Soong-Heung Jang said, “This program is the beginning of long-term cooperation with Saudi Arabia. Our experience can be the basis for the construction of an extensive training program that involves many areas of nuclear engineering field.”
KAIST has been working in close cooperation with various institutions around the world, which also includes the establishment of KUSTAR-KAIST Institute of Education and Research in July 2010. KAIST is also actively cooperating with UAE Khalifa University in Middle East, sharing faculty, holding joint research programs and exchanging students.
2014.02.03 View 9813 -
MOU on Joint Research Program with KUSTAR
KAIST has signed a MOU on Joint Research Program with KUSTAR (Khalifa, University of Science, Technology, and Research).
The Signing ceremony was held in UAE Abu Dhabi with KAIST President Seo Nam Pyo and KUSTAR Presdient Tod Laursen in attendance.
The MOU contains agreements on seed money project, exchange professors and students program, seminars and workshops, and cooperative closely through funding joint research facilities among other key agreements.
The two universities are considering joint research on educational nuclear power plant simulator, research use nuclear reactor plans and nuclear reactor for saltwater desalination plants. In addition, the field of cooperation will not be limited to nuclear power, but will be broadened to electric and electronic, mechanical engineering, aeronautical engineering, industrial engineering, construction environment, and other fields by appointing KAIST professors to perform educational cooperation programs at KUSTAR.
The cooperation is part of the agreement made by the two respective countries in the Korea export of nuclear power plants to UAE in 2009. KAIST will be helping KUSTAR to develop into a world leading science and technology based education and research institute for the next 10 years.
2011.03.25 View 11431 -
The 5th KAIST President's Advisory Council Held
The 5th KAIST President’s Advisory Council (PAC) was held on October 13 at KAIST. At PAC, President Suh reported important present conditions and achievements of KAIST and introduced the ‘KAIST Vision 2025’ to members of the council which includes top national and international professionals of the Industry-University-Institute collaboration.
Additionally, six latest research assignments of KAIST were selected and presented to the PAC. President Suh also presented the Freshman Design Course, Renaissance Ph.D. Program, KAIST-KUSTAR Cooperation Program, and the visions of Neil Pappalardo Medical Center and received advice from the council.
Through PAC, KAIST receives various strategic advices to develop KAIST into a global science and technology university, direct and indirect support on the KAIST development fund collection, and support to create, maintain and develop cooperation relationships with national and international distinguished institutes linked to advisory council members.
International PAC council members include Donald C. W. Kim, CEO of AMKOR A&E; Neil Pappalardo, former MEDITECH CEO; John R. Holzrichter, President of the Fannie and John Hertz Foundation; Papken Der Torossian, CEO of Vistec Semiconductor Systems Group; Adnan Akay, Vice President of Bilkent University; Arden Bement, Director of the National Science Foundation (NSF); Tod Laursen, President of KUSTAR in the UAE; Lars Pallesen, President of the Technical University of Denmark and Hiroyuki Yoshikawa, former President of the University of Tokyo.
National PAC council members include Kim Woo Sik, President of the Creativity Engineering Institute; Jin Hyun Kim, Chairman of the Committee for the Establishment of the National Museum of Korean Contemporary History; Myung Ja Kim, President of the Green Korea 21 Forum; Lee Hee Gook, President of LG Siltron; Lyu keun Chul, Professor of Bauman Moscow State Technical University; Bo-Young Kang, President of Andong Medical Group; Kwon Oh-Gap, former Vice Minister of Science and Technology; Sang chun Lee, President of Korea Institute of Machinery & Materials; and Bae Soo Hoon, Director of the Museum of Contemporary Art, Korea.
2010.10.20 View 13266 -
President Nam Pyo Suh of KAIST discussed cooperation with KUSTAR on the training of skilled manpower for research and development (R&D)
Representatives from Korea Advanced Institute of Science and Technology (KAIST), Khalifa University of Science, Technology and Research (KUSTAR), Emirate Nuclear Energy Corporation (ENEC), and the Institute of Applied Technology (IAT) had a meeting on mutual cooperation at the Intercontinental Hotel in Abu Dhabi, the United Arab Emirates (UAE), on January 14, 2009.
Participants of the meeting were President Nam Pyo Suh of KAIST, President Arif Sultan Al Hammadi of KUSTAR, President Mohamed Al Hammadi of ENEC, and Director General Abdullatif Mohamed Al Shamsi of IAT.
A press conference on the training of skilled manpower for research and development (R&D) in the UAE followed afterwards.
At the end of December in 2009, a Korean consortium led by Korea Electric Power Corporation (KEPCO) beat bids from its competitors to construct four nuclear power plants in the UAE. Representing the consortium, Minister Kyung Hwan Choi of Knowledge Economy Ministry signed a comprehensive agreement with KUSTAR and the Institute of Applied Technology (IAT) for the delivery of nuclear power plants.
On his visit, President Suh discussed with KUSTAR the agreement above in greater detail on subjects, where KAIST renders its cooperation, such as research collaboration, university degree program, and training to produce qualified personnel necessary for the development of UAE’s nuclear energy industry.
On research collaboration, sharing its expertise and knowledge accumulated years from the operation of academic and research programs, KAIST agreed to provide cooperation to KUSTAR in developing the latter as a leading science, technology, and research university in ten years through mutual activities such as research collaborations, recruitment and exchange of outstanding researchers and graduate students, expansion of research facilities, and creation of major research policies. Furthermore, in support of nuclear energy program in the UAE, KAIST agreed to develop a joint research program in nuclear engineering and exchange faculty members and students for research collaboration.
On a university degree program, KAIST agreed for mutual cooperation to launch academic programs at KUSTAR, covering BSc, MSc, and PhD degrees to specialize in areas such as mechanical engineering, electrical engineering, nuclear engineering, biomedical engineering, nano technology, science, and information technology. To that end, KAIST will dispatch its faculty to KUSTAR; provide assistance in developing curriculum and teaching materials; and exchange students for research collaboration.
President Arif of KUSTAR mentioned that the university will cooperate with the relevant institutions in Korea, i.e., Korea Development Institute (KDI) and the Korea Institute of Nuclear Safety (KINS), to train skilled workers required for the development of nuclear energy program in the UAE.
He also added, “These cooperative programs will introduce more educational opportunities to our students, and as a result, they can make greater contributions to the development of our nation’s future technologies in various areas. Our students will have a chance to study a broad range of academic subjects through partnership made with the Republic of Korea, and I expect to see improvements in our engineering programs by integrating KAIST’s state-of-the-art academic courses into our system.”
President Arif expressed his hope “to increase cooperation beyond the agreement made between the two countries, like allowing more exchanges and interactions with KAIST for the development of science and technology in Korea and the UAE.”
“Establishing mutual cooperation between KAIST and KUSTAR is a historic event not only for our two universities but also for our two countries. The two universities will make a great contribution to the improvement of the future of humanity by working together to solve the most important, difficult issues faced in the 21st century,” said President Suh.
He also said that “all members of KAIST community will make our utmost efforts to advance the quality of education in two schools and to implement innovative researches through mutual cooperation.”
KUSTAR, a national university in the UAE, was founded on February 13, 2007 by a mandate of the current President Shaikh Khalifa Bin Zayed Al Nahyan to create a higher education institute.
KUSTAR has been building its permanent campus in Abu Dhabi, the capital of UAE since establishment and merged with the campus in Sharjah (formerly known as Etisalat University College with 18 years of history) in 2008. The University offers education and research programs in five disciplines of engineering, logistics and management, health science, homeland security, and applied science.
There are more or less 30 foreign accredited universities set up in the UAE from countries like the US, UK, Australia, France, Ireland, and Canada. Examples of such, among other things, are New York University Abu Dhabi campus and Middlesex University Dubai campus.
Many of the foreign universities in the UAE, however, have colleges of pharmacy, computer science, aviation, management information, fashion design, business management, and medical science including Harvard Medical School Dubai Center, but not many in science and research. Therefore, KAIST’s assistance in KUSTAR’s endeavor to become a leading science and research university in the UAE is timely. The current government of UAE anticipates, with a great interest, to see a leading science and research intuition built in their nation.
Attachment: Current Status of Universities in the UAE as of 2009
Background Information
The United Arab Emirates (UAE) is a federation of seven emirates (Abu Dhabi, Dubai, Sharjah, Ajman, Umm al-Quwain, Ras al-Khaimah, and Fujairah) situated on the Arabian Peninsula, which borders with Oman and Saudi Arabia.
The UAE has the world"s sixth largest oil reserves. As of 2008, its gross domestic product is $2,621,000.5 million and its nominal per capita gross domestic product is $5 5,028, becoming one of the most developed economies in the Middle East. The UAE’s total population as of the said year is 4,760.4 thousand, and its purchasing power per capita is 40th largest in the world. The UAE’s Human Development Index for Asian continent is relatively high, ranking 31st globally.
In 1985, the UAE launched its own airline, Emirates Airline, which has become one of the fastest growing airlines in the world. The Emirates Airline is a sponsor for Arsenal soccer club.
The Republic of Korea established full diplomatic relations with the UAE in June of 1980. On December 27, 2009, a Korean consortium led by Korea Electrical Power Corporation (KEPCO) signed a contract with the UAE to build nuclear power plants.
2010.01.15 View 15141