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2020-07 16

[Academics]Professor Ko Min-jae's Joint Research Team Has Developed the New Perovskite Quantum Dot Solar Battery

Hanyang University's Department of Chemical Engineering Professor Ko Min-jae's team announced on July 14 that together with DGIST Department of Energy Convergence Research Center's Professor Kim Young-hoon they have developed the New Perovskite Quantum Dot Solar Battery. This technology also holds light energy electroluminescence characteristics and is expected to contribute to the commercialization of optical technologies such as building-integrated solar energy generation, multi-functional photoelectric devices, and Li-Fi. Quantum dots have great light-absorbing capacities and are one of the key elements of next-generation solar batteries, which absorb light from large areas. The perovskite quantum dot solar battery has the ability to transfer light into electric energy and electricity into light, and is known to have the highest efficiency in the quantum dot solar battery field. In order to synthesize superior perovskite quantum dots, organic ligands, which have a long hydrocarbon chain, are used. Ligands adhere to small perovskite quantum dots of 10 nanometers (nm) on the surface and allow them to disperse in diverse nonpolar solvents. When these quantum dots are well-arranged on boards, quantum dot solar batteries are created. Here, as a long-chain ligand adheres to a quantum dot’s surface, it makes the charge transfer difficult between quantum dots, a process which degenerates solar battery functions and where transfering it to the ligand chain where hydrocarbon is required. The research team focused on the hydrophobicity (not easily combine with water molecules) of benzene group-based phenethylammonium (PEA) ligands. They then succeeded in applying this safely to the perovskite quantum dot's surface. Through this, they improved the efficiency of transforming solar energy into electric power to 14.1% and additionally tried to keep high photovoltaic efficiency stability of over 90% for 15 days in an environment with relative humidity of 20~25%, which is similar to external environments. Doctor Kim Young-hoon said that “we investigated and have discovered for the first time that by applying a ligand which holds both a short hydrocarbon chain and hydrophobicity, that both a quantum dot solar battery’s performance and safety can be improved at the same time,” and that “this will provide a new paradigm for developing and commercializing a next generation quantum solar battery”. In this research, Hanyang University's Department of Chemical Engineering's master’s and doctorate program student Kim Ji-gun and the DGIST Department of Energy Convergence Research Center's post-doc participated as the lead author and was published online in Nano Energy, a world-class journal in the energy science field, on June 15. A performance and safety evaluation of a perovskite quantum dot solar battery with a short hydrophobicity ligand. (photo by: DGIST) Global News Team global@hanyang.ac.kr Translation by: Park Gyeong-min

2020-07 09

[Academics]Professor Choi Chang-hwan's Team Develops a New Material for Steel-genetics that Is Diversifiable into 3D Flash Memory Devices

Professor Choi Chang-hwan, Division of Materials Science & Engineering, and Dr. Koo Bon-cheol, a research team student, have developed a new material that can solve the high-density and low-power problems of 3D flash memory devices. This research has been highly praised for opening up the possibility of reducing flash device thickness, which is a task that must be overcome in order to continuously upgrade current 3D flash memory devices. Current 3D flash memory devices use thin-film materials consisting of oxide, nitride, and oxide (ONO) to store memory. This film has a thickness of 20 nm. 3D flash memory devices need continuous enhancement to improve their performance. However, it is difficult to reduce the thickness of existing ONO thin-film, and it is not easy to improve the speed and power of the flash element. In addition, alternative thin-film materials need to be developed due to difficulties in multi-level cells (MLCs) that can store various information in one cell. Professor Choi's team cooled an aluminum-coated substance in Hafnium oxide (HfO2), forming a new thin-film with residual polarization and an avionics field, maximizing the properties of the steel electrode. Flash memory devices with this feature are highly desirable as they can easily be repaired using improved polarizing properties. Moreover, the thin-film thickness can be implemented even if it is under 10 nm. Also, the properties of the steel-genetic have been improved as they induce a stable orthorhombic phase through high-stress deformation. Not only that, but Hafnium oxide is also a material that has been proven to be reliable in the field of logic semiconductors. Manufacturers being able to manufacture new Nand flash memory using this material without further investment is a significant benefit. This study was conducted by a team led by Professor Song Yun-heup, Department of Electronic Engineering, with the support of Samsung Electronics' Future Technology Development Center. It was introduced at a symposium on very-large-scale integration (VLSI) by the Institute of Electrical and Electronics Engineers (IEEE), a world-renowned association on semiconductors, which ran for six days starting on the 14th. In particular, this study was chosen as one of the "highlighted" theses by the technical committee and was introduced to the media, allowing it to gain the spotlight. The Symposia on VLSI Technology and Circuits, which celebrated its 40th anniversary this year, is the most prestigious conference in the field of semiconductors, along with the International Electron Device Meeting (IEDM). Annually, the conference presents the latest research on semiconductors and selects the papers that have contributed the most to semiconductor companies and academia. This year's conference was carried out online due to COVID-19 and received the most theses in 10 years. Out of the 248 papers that were received, 86 papers were selected as the most influential thesis of which only 29 papers were sponsored by universities"?). Professor Choi said, "Technology to implement strong-genetics is emerging as a trend in academia," and he added "this is the first good example that has raised the generation of Hafnium oxide material, which will be used for NAND-flash high-density integration, to nearly universal level." In addition, he mentioned that "Out of the 8 ferrogenic thin-film thesis papers that were chosen, 5 were from companies and 3 were from universities". He said, "The research team from Hanyang University was the only Korean university to have a thesis selected," and added "it is rare to present a research conducted by university without any cooperation or sponsor of enterprises. This study is expected to contribute to the development of the thin-film that can be implemented in 3D flash memory devices." AlHfO2 showing the properties of ferroelectric by quick cooling, completed by Professor Choi Chang-hwan's research team. <Origin: Hanyang University> More on [(HanyangWiki)] http://hyu.wiki/강유전체소재개발 Global News Team global@hanyang.ac.kr Translation by: Lee Hee-jin

2020-07 07

[Academics]Hanyang Intelligence Data System Laboratory Participates in a Consortium for a Digital-Platform-Based Enterprises Support

The Hanyang Intelligence Data System Laboratory of the Department of Industrial Engineering has been selected for the Digital Platform Based Private Business Proliferation Support Project (PoC) being conducted by the National Information Society Agency. The Laboratory will task with supervision and cooperation?) with Autocarz and Genieworks, tackling illegal parking on the digital platform. The project aims to solve Seoul's illegal parking problem by planning and implementing a new business model, using the base of the public consolidated platform developed by the Seoul Metropolitan Government last year. At the same time, the consortium aims to commercialize the business model planned by private enterprises. The consortium is planning to create an artificial-intelligence-based prediction probability model on illegal parking, by collecting, processing, and analyzing various data. Utilizing these data, the consortium is also planning to showcase an array of additional services by the second half of the year. One of the services is an Open API Portal Service on Parking Control Prediction Information, which designs and develops a parking control prediction probability model and provides the generated information to O2O businesspersons in an Open API form. Since the data make it possible to target when and where the number of illegal parking frequently occur, parking lot operators and others can use it as important sources for location-based marketing. Also, it could serve as baseline data for analyzing the business area regarding vehicle maintenance and car wash businesses. Mun Chang-hun, the CEO of Autocarz, mentioned that he hopes to raise awareness about illegal parking problems among drivers through the implementation of this empirical project. He also added that he would like to contribute to the mitigation of traffic through additional services, the creation of new jobs in areas such as parking and car washing through the release of the data to the third parties. Global News Team global@hanyang.ac.kr Translation by: Lee Won-young

2020-06 23

[Academics]Professor Eun Yong-soo Publishes a Book Related to International Relations Theory Through Routledge

Professor Eun Yong-soo Professor Eun Yong-soo from the Department of Political Science and International Studies recently published a book based on his studies related to international political theory through Routledge, a British publishing house. In his latest book, Going beyond Parochialism and Fragmentation in the Study of International Relations, Professor Eun presents limitations and alternatives to the already existing Western-centered theories of international politics. McGill University’s Professor T. V. Paul who is also a former president of the International Studies Association and Professor Colin Wight from the University of Sydney both took part in the publication of Professor Eun’s book. Founded in 1836, Routledge currently has more than 20 SSCI-level Humanities and Social Sciences journals. Meanwhile, as a professor in the Department of Political Science and International Relations, Professor Eun Yong-soo has published his papers as an independent author for all the official journals from the world’s four major political science and diplomacy societies: the American Political Science Association (APSA), the International Studies Association (ISA), the Political Studies Association (PSA), and the British International Studies Association (BISA). He has also been researching international political theory and postcolonialism. The cover of Going beyond Parochialism and Fragmentation in the Study of International Relations *Link for the publisher’s website and Professor Eun Yong-soo’s book: https://www.routledge.com/Going-beyond-Parochialism-and-Fragmentation-in-the-Study-of-International/Eun/p/book/9781138063006 Read more about Professor Eun Yong-soo on [Hanyang Wiki]: hyu.wiki/은용수 Global News Team global@hanyang.ac.kr Translation by: Lee Jung-joo

2020-06 01 Important News

[Academics][Excellent R&D] Standing at the Center of Cutting-Edge Technology

Although there have been notable advances in the study of natural science, research related to high pressure has not been active in Korea due to the lack of groundwork technology. Professor Kim Jaeyong (Department of Physics) is opening up the route to high pressure research through the HYU-HPSTAR-CIS High Pressure Research Center, the hub of collaboration between the world-class institutes. Professor Kim Jaeyong (Department of Physics) is paving the way for high pressure research in Korea. The HYU-HPSTAR-CIS High Pressure Research Center was established in 2016 with support from The Ministry of Science and ICT. The research center is in a collaborative relationship with the Carnegie Institution for Science (CIS) of the United States and the Center for High Pressure Science and Technology Advanced Research (HPSTAR) of China. The three institutes are consistently sharing their research outcomes by holding joint symposiums and reinforcing researcher exchanges. Kim explained the collaboration as “a successful case of acquiring advanced technologies by bringing in world-class institutes,” referring to the research spirit of the center as “Moon Ik-jeom spirit.” Moon is a historical figure who brought cottonseed from China into Korea, allowing the country to produce and distribute cotton to citizens. Just as Moon did in the past, Kim attained three diamond anvil cells, high pressure devices that enable the compression of a small piece of material with extreme pressure, from HPSTAR in 2016. Within a short period, Kim succeeded in producing a unique version of the cell. The center’s main focus is on hydrogen energy storage. The have recently reported successful results in the reversible storage of hydrogen energy. By imposing high pressure in Ti-Zr-Ni Quasicrystals, the research team was able to keep 4.2 wt of hydrogen at room temperature. Kim hopes that the results will contribute to the commercialization of hydrogen-powered cars. Kim hopes to contribute to the commercialization of hydrogen-powered cars with his recent research. Kim has demonstrated his will to help position the HYU-HPSTAR-CIS High Pressure Research Center as the hub of high pressure research. Kim also encouraged more students to participate in the research. “Our university has sufficient human resources, research conditions, and support systems to conduct the research,” said the professor. “I hope the students can feel the sense of thrill that comes from standing at the center of cutting-edge technology.” Oh Kyu-jin alex684@hanyang.ac.kr

2020-06 01

[Academics][Researcher of the Month] Effective Use of Photocatalysts to Combat Environmental Problems

Numerous attempts have been made by engineers to apply technology to our everyday problems. Professor Park Jae-woo (Department of Civil and Environmental Engineering) tackles one of the most critical problems of our time, environmental pollution, using the special characteristics of nano photocatalysts. His research focuses on resolving the problems caused during the reduction-oxidation process of photocatalysts. Through his research, he has discovered that the use of the Charge Transfer Layer (CTL) is significantly effective, and expects the findings to help organic pollutants decompose through photocatalysts, which will lead to a cleaner society. For the past 15 years, Park has been conducting research on the development of magnetic-cored dendrimers and nano-photocatalysts for the purpose of environmental purification. According to Park, nano-photocatalysts have the power to commence oxidation in hazardous substances by separating electrons from holes. This process of oxidation converts substances into water and carbon dioxide gas, which are harmless to the environment. However, despite their striking capabilities, photocatalysts have their shortcomings. In his research, Park focused on compromising with the photocatalysts' technical problem. For the past 15 years, Professor Park Jae-woo (Department of Civil and Environmental Engineering) has been conducting research on the development of nano-photocatalysts for the purpose of environmental purification. The problem with the use of photocatalysts One of the biggest disadvantages of using the reduction-oxidation of photocatalysts is that electrons have the tendency to return to their respective electron holes. Their tendency to recombine after separation lowered the rate at which photocatalysts oxidized harmful substances, and many researchers have sought out ways to prevent the recombination of electrons with the electron holes. The existing methods such as doping, facet, and core-shell merely slow down the rate at which electrons recombine with electron holes and fail to completely separate them. However, Park has succeeded in permanently separating the electrons using the CTL. How was CTL used? A photocatalyst which utilizes the CTL is comprised of three components: the photocatalyst which forms a pair of electrons and electron holes, the CTL which moves the electrons selectively, and the collector which accumulates and stores the moved electrons. Here, the CTL, being the main component, carries the electrons while inhibiting their passage through electron holes. As a result, the electron is moved from the photocatalyst to the electron collector, and suppresses them from recombining. What makes Park and his team’s accomplishment so unique is the fact that their work did not stop at only delaying the recombination, as previous methods had done, but also entirely prevented recombination by separating the electrons and shutting down the reverse-travelling by maintaining a high level of catalyst reaction. The result of the research “We have conducted two experiments to prove there is an increased activation of catalysts by using the CTL in the mentioned study,” said Park. He continued, “The first, is hydrolysis. A catalyst under the influence of the CTL displayed 78% higher hydrogenative yield than the existing one in the visible ray photography. Then, in the experiment with the subject bisphenol A, which is an organic pollutant, the catalyst showed a very high 93% removal rate after three hours of reaction." Park also believes that catalysts utilizing the CTL can be applied to energy and environment-related fields in an extensive range. Park said, “I want to thank my graduate school students, whose effort and sweat have made all this possible.” Park expressed gratitude to his graduate school students, whose effort and hard work have made the project possible. “It motivates me to reflect on my mindset when I see students working so hard on the research topic.” He especially thanked Hassan Anwer (Civil and Environmental Engineering, Doctoral program) for his devotion to the research. Lee Yoon-seo cipcd0909@hanyang.ac.kr

2020-05 29

[Academics]Hanyang University Professor Jang Yong-woo Opens the Door to Developing Targeted Therapies for Parkinson’s Disease

Professor Jang Yong-woo On May 27, Hanyang University announced that Professor Jang Yong-woo (Department of Biomedical Engineering) recently developed targeted treatment method of Parkinson’s disease. In this study, Professor Jang, along with Professor Kim Kwang-soo of Harvard Medical School’s McLean Hospital and Professor Yoon Ho-seop of Nanyang University of Technology in Singapore, discovered the "ligand"*of the Nurr1 nuclear receptor, which is involved in the generation and maintenance of dopamine neurons. Parkinson’s disease is a degenerative brain disease that is caused by a gradual decrease in nerve cells in the midbrain that secrete dopamine. The Nurr1 Protein inside the dopamine nerve cell is crucial for the dopamine nerve cell generation and survival and is known as an important nuclear receptor that regulates dopamine synthesis. The function of the Nurr1 nuclear receptor is regulated by the ligand, which is a biomolecule that binds with the Nurr1 nuclear receptor, and the Nurr1 nuclear receptor and dopamine can be activated through ligand control. However, until now, there have been limitations on regulating the Nurr1 nuclear receptor with drugs as no ligand has been found. (Photo by: Nature Chemical Biology) Through years of experiments with molecules, structures, cells, and animal experiments, Professor Jang’s team has found that the Lipid Metabolism materials, Prostaglandin E1 (PGE1) and Prostaglandin A1 (PGA1), directly combine into the Nurr1 nuclear receptor and ligand binding domains to control dopaminergic synthesis and the genes necessary to maintain dopamine neurons. In actuality a mouse induced with Parkinson’s disease in an animal model experiment was injected with PGE1 or PGA1 drug and recovered 80% of the Parkinson’s disease affected motor skills. Additionally, when comparing and analyzing the mesencephalon of a mouse, the secretion of dopamine in the midbrain of an animal with drug injection nearly doubled, and the survival rate of dopamine nerve cells increased by up to 80%. Professor Jang Yong-woo said, “The lack of drug effectiveness for Parkinson’s disease has been a major challenge in the development of treatments, and the study found that Nurr1 is no longer a nuclear receptor without ligand.” He also added that “along with the intrinsic metabolites, the discovery of additional synthetic ligands will pave the way for the development of Parkinson’s disease targeted treatment.” These findings were published on May 26 in Nature Chemical Biology, a sister journal of Nature and a world-renowned journal in the field of biochemistry. *Note) Ligand: Substance that uniquely bonds to large molecules such as receptors and plays a major role in the development and use of medicines as well as in vivo. *Introduction to the paper (Nature Chemical Biology) https://www.nature.com/articles/s41589-020-0553-6 Global News Team global@hanyang.ac.kr Translation by: Park Gyeong-min

2020-05 04 Important News

[Academics][Researcher of the Month] From Seawater to Fresh Water

Droughts and water shortages are serious global threats. However, many technical developments are in progress to resolve these problems, and one of them is desalination. Desalination is the process of separating the salt in seawater from the water in order to get usable fresh water. However, the currently available technologies have the problem of sustainability, for they require fossil fuel and costly factories to be constructed. To suggest an alternative, Professor Kwak Rho-kyun (Department of Mechanical Engineering) is researching electro-membrane desalination. Professor Kwak Rho-kyun (Department of Mechanical Engineering) has been working on the topic of electro-membrane desalination for 10 years. Electro-membrane desalination uses the division of positive ion and negative ion when salt dissolves in water. The positive and negative ions are drawn to each pole when voltage is applied. Intersecting the membrane that makes each ion between electrodes pass through, called the exchange membrane of positive and negative ions, salt ions can be collected and removed. What is left is fresh water with the saline ions removed. Kwak has been working on the topic for 10 years, since he was a doctoral student. He said he first began his research inspired by the idea from his Ph.D. advisor that the unusual migration phenomenon of biomaterials such as DNA and ions would also occur in the electric membrane desalination system. His first goal was building a system of electro-membrane desalination to check whether the migration of biomaterials such as DNA and ions appear in the system of electro-membrane desalination, and visualizing the migration of the ions inside. Based on the visualization research, Kwak studied various subjects such as improving the efficiency of existing desalination devices and of treating the produced water. Kwak expressed special gratitude toward his graduate students who have helped him throughout the research process. Kwak said the significance of the study lies in that it developed a promising futuristic desalination technology, enabling Korea to become a global powerhouse to solve the future water shortage problem. Kwak’s innovative research has been highly acknowledged, introduced in journals like PRL and JOFM and others on the topics of desalination and water research. Kwak also expressed gratitude toward his graduate school students who have helped him throughout the research process. “I really want to thank my students. Their hard work was what made it possible to achieve such good research results,” said Kwak. Hwang Hee-won whitewon99@hanyang.ac.kr

2020-05 03

[Academics][Excellent R&D] How Data Science Connects with Society

Data science is the use of the scientific method to obtain useful information from computer data. As it gives new insights into a vast amount of data, there exists an interdisciplinary approach in social science to compensate for what they might have missed through traditional methods with data science. Professor Cha Jae-hyuk (Division of Computer Science and Engineering) developed a platform that accelerates the convergence of the two disciplines. Professor Cha Jaehyuk (Division of Computer Science and Engineering) established a platform that merges data science with social science. Data science is expected to bring about a new horizon in social science as social issues are becoming more complex. “We are now in a hyper-connected society where small changes bring about significant ripple effects,” explained Cha. Traditional social research methods could easily result in biases as they rely on surveys which only take a small amount of data into consideration. Cha expects computational social science to contribute to the analysis of potential risk factors and to establish sustainable policies for vulnerable, multi-dimensional social issues. Cha is currently working to build a platform that integrates data science into social science. The platform consists of three subgroups that make social models through continuous monitoring and data collection. One deals with societal anxiety through analysis of social networking, whereas another group covers disability rights in relation to social mobility. The third digs deeper into public health issues, especially related to infectious disease control. Cha’s role is the general management of the platform. He added that the research is mainly done in association with seven social scientists and nine data scientists. There are the three subgroups which researchers use to create social models through monitoring and data analysis. (Photo courtesy of the Computational Social Science Center) Cha highlighted the importance of the platform as a channel for conversation. “Interdisciplinary, multidisciplinary, and transdisciplinary approaches open the way into problems that are difficult to address through the methods of traditional disciplines,” said Cha. This platform lets researchers from two disciplines share the outcomes and objectives of the study through visualization. Cha also revealed his plans as a director of the Computational Social Science Center. “I have seen researchers struggling due to academic barriers between the two disciplines,” said the director. Cha expects to foster interdisciplinarians who grasps the essentials of both data science and social science and can bridge the gap between the two fields of study. A breakthrough occurs when we bring down boundaries and encourage disciplines to learn from each other. Cha is opening the way to the resolution of social issues through the convergence of data science and social science. Oh Kyu-jin alex684@hanyang.ac.kr

2020-04 28
2020-04 28 Important News
2020-04 28

[Academics]Professor Kim Do-hwan and His Research Team Develop Ultra-sensitive Iontronic Graphene Tactile Sensors with Ionic Liquid Droplets

Professor Kim Do-hwan’s research team, from Hanyang University’s Department of Chemical Engineering, announced on the 20th that he and Professor Lee Wi-hyoung’s research team, from Konkuk University, developed flexible and transparent iontronic graphene tactile sensors (i-GTS) with superior sensitivity, using the dynamic characteristics of liquid droplets. ▲The following is the mechanism proposed for this study of tactile sensors. A model diagram that senses pressure from changes in capacitance as ionic liquids fixed on the graphene grid comes into contact with the upper graphene electrodes. As wearable sensors have started to become more popular, the need for smart interface technology that can recognize users’ surroundings in real-time, along with electronic skin technology has become more crucial than ever. The most important technology for electronic skins is a tactile sensor technology that has sensitive recognition techniques even under minute pressure. Both research teams took advantage of the phenomenon where ionic liquid was fixed between the two graphene grid layers, and the upper electrodes made of graphene spread in contact with the ionic liquid. Through this, the research team was able to develop an iontronic graphene tactile sensor that is highly sensitive to even the finest touch. Their discovery is highly anticipated, as tactile sensors are manufactured with large-area integrated arrays, they have the advantage of creating less confusion between the devices, which is expected to minimize touch errors. It is expected that the iontronic graphene tactile sensors developed in this study will be applied to various fields, such as flexible displays and healthcare devices, as they have excellent sensitivity sensors and fast recovery speed. The graphene electrodes/active ionic liquid layers are transparent and flexible, so it is expected for them to be used as wearable graphene tactile sensors that can give various visual effects and body adhesion. This study, by Professor Kim Do-hwan (Hanyang University, Corresponding author), Kim Joo-sung, a Ph.D. candidate (Hanyang University, Lead author), Professor Lee Wi-hyoung (Konkuk University, Corresponding author), Researcher Lee Seung-chul (Konkuk University, Lead author, Ph.D. graduate, Researcher for LG Display), received grants from the Ministry of Science and ICT’s Global Frontier Research Program (Center for Advanced Soft Electronics) and from the Basic Science Research Program of the National Research Foundation of Korea. Additionally, this study first demonstrated a paradigm that a graphene tactile sensor can be developed with fast recovery speed using the dynamic characteristics of liquid droplets, and in recognition of its excellence in research, this study was chosen as a cover thesis for the April issue of Advanced Functional Materials (IF = 15.621)’, a leading international academic journal for the field of materials. Global News Team global@hanyang.ac.kr Translation by: Lee Jung-joo