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2017-03 06 Important News

[Academics]Spin-Orbit Interaction and Holographic Theory

Physics is an indispensable domain to invest in as it generates fundamental knowledge for technological infrastructure and future advancements. Accentuating the importance of the field, Professor Sin Sang-jin (Department of Physics) puts strenuous effort into enlightening unresolved physical phenomena. In his paper "Character Of Matter in Holography: Spin-orbit Interaction," Sin elaborated the relationship between holographic theory and spin-orbit interaction using graphite to decode the enigma. String theory and spin-orbit interaction Physical phenomena relating to the notion of gravity can be explained through Einstein’s general theory of relativity at a macroscopic level. However, narrowing down the matter and studying at a microscopic level, the so-called quantum gravity theory must enter the picture. Among other quantum gravity theories, the prime candidate that is attracting much interest is string theory, which states that the smallest particle of matter is not a point molecule but a vibrating string, which cannot be decomposed further. String theory focuses on holographic duality (also known as gauge/gravity duality) as a novel method of approaching and connecting a range of subjects, including quantum gravity. The movement and interaction between the electronic system are not holistically mastered by physicists, rendering the strongly correlated electronic system cryptic. By employing the holographic theory, which states that the description volume of space could be encoded on a lower-dimensional boundary to the region, can explain not only electron-to-electron interaction but also lattice-electron interaction. Of the interactions of electrons, spin-orbit interaction is what Sin sheds light on. Sin describes the complexity of the relationships between several theories. Spin-orbit interaction is a type of particle interation which causes shifts in an electron’s energy level caused by the electromagnetic interaction between the electron’s spin and the magnetic field. This field is generated by the electron’s orbit around the nucleus. The big question here was to figure out how to fit this interaction into the holographic theory, which connects to another phenomenon called anomalous hall effect. This effect is the traversing of electric current in the magnetic field perpendicular to the current, with no electromagnetic force applied. What is peculiar is the aberration; perpendicular traversing would happen only when electromagnetic force is applied. To find the answer to this puzzle, Sin applied the magnetization curve of graphite to the spin-orbit interaction, which fitted suitably. This was because the magnetization curve of graphite was well-depicted by the strong interaction between electrons. Uncountable layers of graphene make up graphite, corresponding to the strongly interacting temperature and density. The ultimate goal of Sin’s research is to construct a solid theory of physics for novel materials. In the process, string theory and holographic theory are incorporated to the core concept. “This particular research paper at hand merely managed to link the notion with spin-orbit interaction, which could be compared to just one tree out of an entire forest. I aim to theorize the strongly-correlated electronic system,” noted Sin. “Many say there aren't any phenomena which can’t be explained with theories formed 100 years ago. This isn't true in my view. Physicists today still cannot explain matters with the strongly correlated electronic system. There is no end to physics and its exploration,” added Sin. Sin asserts that physics is the base of all phenomena. Jeon Chae-yun Photos by Choi Min-ju

2017-03 02

[Event]Hanyang University Seoul Campus Residence Opening

Hanyang University held an opening ceremony of Student Residence Hall V, which can accommodate 400 students at the Seoul Campus to secure students' housing problems. In this dorm, the university decided to prioritize freshmen who are unfamiliar with college life and students from low-income class with housing cost burdens. The dormitory, which has a total construction cost of 170 billion won, has a total area of 9,561m² and a total floor space of 12 floors, totaling 197 rooms and accommodating 398 people. Most of the students live in a double room. Accordingly, the opening ceremony was held on February 24th in Seoul Campus and Kim Hye-chun, the chief director of Korea Foundation for the Promotion of Private(&Public) School, Kim Chong-yang, the chairman of Hanyang Foundation, and Lee Young-moo, the president of Hanyang University attended the ceremony. ▲At the opening ceremony of Student Residence Hall V held at Seoul Campus on 24th, Lee Young-moo, Hanyang University President is delivering his speech. ▲ At the opening ceremony of Student Residence Hall V held at Seoul Campus on 24th, the attendees are participating in tape cutting ceremony.

2017-03 02 Important News

[Event]The 78th Matriculation Ceremony

On the morning of February 27th, the freshmen and their parents gathered at the Olympic Gymnasium in the HYU Seoul Campus to partake in the 78th Hanyang University matriculation ceremony. Freshmen of 2017 gathered together to take their first steps as university students by attending the ceremony- “Made by Freshmen”. The 78th matriculation ceremony of Hanyang University took place at Olympic Gymnasium on February 27th. Prologue Before the entrance ceremony, Hanyang University recruited freshmen for two acts: “Hanyang Dance Leader” and “Hanyang Matriculation Ceremony Organizer.” Hanyang Dance Leader From January to the day before the ceremony, 15 freshmen from various departments practiced dance moves for 4 hours every day, including the weekend. Their performance was directed by Kim Sae-hwan, a dance trainer of Cube Entertainment, including professors from the Department of Dance. Four songs were performed- a ballet dance and three K-Pop songs. The Hanyang Dance Leader team, practicing for the performance. Kim Hyun-ji (Department of Theater and Film) “I am lucky to be a part of Hanyang Dance Leader. I learned how to dance professionally through this program and met new friends from other departments. It was also a great pleasure to meet some Cube Entertainment artists too. I hope that those who see my performance will get to know my bright side!” Kim Hyun-ji (Department of Theater and Film) Kang Hee-won (Department of Electrical and Bioengineering) “I am excited and afraid at the same time to be standing on stage in front of many students, my parents, and professors. I will devote all my energy to performing successfully! I also want to thank my dance team members at Hanyang Dance Leader because we became great friends. Even though I may not be good enough, please enjoy our dance!” Kang Hee-won (Department of Electrical and Bioengineering) Jung Ui-joon (Division of International Studies) “Hello, everyone! I am the center and the face of this Hanyang Dance Leader. (Laughs) I always wanted to become an entertainer so I jumped at the chance when the opportunity came up. Hanyang Dance Leader taught me what real dancing is. The best part during practice was when I saw Hyun-A from Cube Entertainment. She was so beautiful… It was amazing. We will burn the stage with our passion, so please pay attention!” Jung Ui-joon (Division of International Studies) "I have a medicated patch on my neck because it hurts when I do fierce dance moves." Choi Jae-hyuk (Professor of the Department of Dance) “I thank all these students even though it has been a tough month full of sweat and tears. It's totally fine if they make mistakes onstage. I just want them to have cheery memories that they'll remember throughout their life.” Choi Jae-hyuk (Professor at the Department of Dance) "Making memories is the most crucial part of this project." Hanyang Matriculation Ceremony Organizer There also were 17 freshmen behind the stage who made a project proposal to outline and organize the matriculation ceremony. Since January, they met three times a week, from 1:00-9:00 PM, to discuss, plan, and evaluate their outline. The theme was 'Baby Lion', deriving from the Hanyangian mascot HY-Lion. The Hanyang Matriculation Ceremony Organizer team are discussing in a meeting to finalize their plans. “During the month of organizing the ceremony, we all enjoyed becoming friends with each other, getting to know Professor Joo Ji-hee, and learning how to intrinsically and officially organize an event. Even though not every part of our plan became part of the ceremony, we are still proud that freshmen like us could lead such a big event.” Joo Ji-hee (Professor at Department of Theater and Film, director of the team) “It was such a wonderful experience for me to lead this passionate team of freshmen. As major players of the school, these freshmen have shown their love for Hanyang and their excitement to be a part of Hanyang. I believe that if they treasure this pure attitude, they will always be successful wherever they go.” The 78th Entrance Ceremony At 9:30 AM on 27th February, the ceremony officially began with alumnus Kim Myung-kun (Department of Voice, ‘14)'s lesson- teaching the school song to freshmen. Pianist on the left, Kim Myung-kun (Department of Voice, '14) on the right. “Congratulations to all freshmen of 2017. I wish all the best for you, and I hope that Hanyang University will lead you onto the international stage where you can make Koreans proud. Just as it is written in the school song, continuoulsy devote yourselves to your future.” The next session was an academically inspiring lecture given by professor of the Department of Business and a representative at Monaissance, Kang Shin-jang. Professor of Business and a representative at Monaissance, Kang Shin-jang. “Do you know what 77177 means? It means that I was accepted to Hanyang University in 1977, you became freshmen in 2017, and I’m given 7 minutes to lecture.” (Laughs) “Steve Jobs once said that he was standing on the crosspoint of technology and humanity, because technology cannot satisfy the human heart. A quote from a poem by the Korean poet, Ko Un, goes: ‘I saw that flower coming down the hill. One that I hadn’t, coming up the hill.’ Concentrate on humans in the future that you create. Concentrate on little things like flowers. Congratulations.” Next, Hanyang University’s president Lee Young-moo gave an inspiring speech to encourage the new students and lead them onto their academic path. President Lee Young-moo is giving a speech to freshmen. “The two most important points to underscore are volunteering and the 4th Industrial Revolution. In this technological era, we can use our knowledge and technology to volunteer and bring love and help to others. The 4th Industrial Revolution is close at hand. In 2021 - when you graduate - there will be even grander changes. Adapt your paths for the future.” Another priceless corner prepared by the ceremony was the “Moving Story Speech”. A freshman from the Department of Mechanical Engineering, Choi Hye-min talked about her volunteering experience at high school. She has successfully fundraised and donated 150 million won to help out the victims of the 2015 Nepal earthquake incident. Choi Hye-min (Department of Mechanical Engineering) "My life motto is: 'Everyone in this world should be happy'." “My high school and a Nepali school had set up a sisterhood agreement. We have shared precious memories together with our Nepali friends. When I heard that an earthquake occurred in Nepal, I suddenly thought of my friends and searched for ways to help them out. As a representative for high school students, I stood at the 300 Round Table Debate hosted by the Chungnam Office of Education and successfully persuaded them to donate.” “Whether it's volunteering or studying, or even drinking and hanging out, I want to do my best.” After a few more speeches, the Hanyang Entrance Ceremony Organizer team and the Hanyang Dance Leader team introduced themselves and showed off their hard work built up during the past few months. Hanyang Dance Leader team performing on the stage. The Hanyang Dance Leader team. The Hanyang Matriculation Ceremony Organizer team. Just like the theme of the 78th matriculation ceremony, the two groups of freshmen lit it up. The president of the Hanyang Alumni Association, Yang Won-chan, also relieved the parents of their worries. “300,000 Hanyang University alumni root for this year’s freshmen. Dear parents, thank you for your 18 years of support for your children. Entrust them to their school seniors and to Hanyang!” Professor Ko Sung-hyun and his students perform to congratulate the freshmen of their matriculation. Professor Ko Sung-hyun and a quartet composed of his students also delivered a beautiful performance to welcome the freshmen. Epilogue Aspirations of Freshmen Mo Ah-ri (Department of Traditional Korean Music) “Because it took me one extra year to come to Hanyang University, I am extremely happy and proud to be here. I hope my college life will be as wonderful as I expect it to be.” Kim Jun-hyuk (Department of Computer Engineering) “Thanks to all who prepared such a wonderful ceremony. I'll be studying hard and enjoying my university life.” A group of freshmen from the Department of Applied Art. Parents’ Words of Encouragement Father of Kim Jun-hyuk (Department of Computer Engineering) “My dear child, I am immensely proud of you, now that you've officially become a student of Hanyang University. As I am standing here at the ceremony, I cannot be happier. Don't give up, even when hardships come at you, and overcome any problem with wisdom as you have always done. Stay healthy and happy.” Parents of Sohn Jong-beom (Department of Theater and Film). Father of Sohn Jong-beom (Department of Theater and Film) “Dear son, I wish you all the best for a brighter future. Enjoy your time at university, and live a life that will always remind you of how lucky you are to be born in this world. I hope that the four years at Hanyang will make your life brighter, free, and glittered with happiness. I love you!” Kim Ju-hyun Photos by Moon Hana

2017-02 28

[Policy]Hanyang will become ‘Unlosable Smart Campus’, never lost, always found

Hanyang University will be the first ‘Unlosable Smart Campus’ in Korea since March. A smart device that prevents the loss of items ‘Wichi’ (photo) will be provided free of charge to all freshmen students at Seoul Campus in 2017. Wichi looks similar to that of a car remote control, and it is composed of only one button so that it can be attached to any items such as a smart phone, bag, and laptop that are likely to be easily lost. It works through the Bluetooth function. If an item is lost, the smartphone application, designed to generate sound and light from the device, will be activated so that the item can be easily found. If the item is at a long distance (10 meters or more), it displays the last place where the item was placed on the map on smartphones. Wichi is a device developed by Hanyang University in cooperation with Wooyang Corporation, a subsidiary company of a technology holdings company established by Hanyang University. Wichi is particularly effective in preventing the loss of smartphones. This is because the device was designed that an alarm goes on when the button is pressed even at an silent mode in order to find where the smartphone is. An official at Hanyang University said, “Wichi will help students solve concerns of losing their items in libraries and classes’. Hanyang University recently announced that it has already passed the performance test done on a sample of students and gotten satisfactory results. Kim Jin-hong, the representative of Wooyang Corporation, said, "We will improve the functions after receiving feedbacks from freshmen for one year. If the satisfaction of Seoul campus students is high enough, we will expand the service to ERICA campus in the future. " ▲ Smart Device ‘Wichi’

2017-02 28 Important News

[Academics][Researcher of the Month] Blue Ocean of Materials Science

Conspicuous or not, our surroundings play a crucial role in navigating our health, holding accountability for small and big degenerations for mankind’s physical wellbeing. Among all, two indispensable elements in our life, air and water, have slow and accumulative effect on the health of the population. Professor Kim Ki-hyun (Department of Civil and Environmental Engineering), whose studies focus on environmental pollution, delineated the means of applying advanced materials in his review paper “Carbon nanotubes: a novel material for multifaceted applications in human healthcare.” Carbon nanotubes in biotechnology As modern material technology has been advancing considerably, its application seems ever-expanding in diverse fields, with nanomaterials as the convenient and indispensable companion. Based on a research paper conducted by other scholars, Kim wrote another, centralizing on the uses of carbon nanotubes (CNT), an emerging nanomaterial that is seeing the light in the biomedical and environmental fields. Its application is versatile: drug delivery, sensing, water purification, composite materials, and bone scaffolds. More specifically, CNTs could be used to alleviate myocardial infarction by enlarging clogged blood vessels, expediting drug delivery, and organizing bone structures in needed parts. Kim outlines his review paper on the application of carbon nanotubes in the biomedical field. Despite all the medical benefits, advanced materials including CNT also have the potential to bring adverse effects. As alien substances could disturb immune or antibody responses, the body functions to react against them. Especially, in case of new materials, unprecedented resistance could occur, and thus their potential impacts must be taken into consideration through attentive examination for possible toxicity. Nonetheless, as long as the criteria are met, CNT and other materials could spark revolutionary breakthroughs that would change the future of mankind. “I think that endless developments are yet to come in the field of materials science to help other research fields like environment and human health flourish. Better materials in terms of cost efficiency and functional effectiveness would be improved while there is yet no limits to such developments. Materials science and nanomaterials would not only be fruitful in biomedical fields but also environmentally,” commented Kim. His interest in new materials are extended toward environmental progress, starting with the sensing of pollutants and purifying polluted medium. The blue ocean Materials science could often be referred to as the 'blue ocean' since there are more to be discovered than what has been excavated so far. On top of this, collaboration with environmental issues is not conventional. Kim is involved in research for integrated environmental monitoring technology, digitizing and managing air, water, and soil pollution. He is looking forward to fuse newly unveiled materials in his research, hoping to bring a constructive result to lay a bridge between materials science and environmental engineering. To set an example, metal-organic frameworks (MOFs) could be used to mitigate environment pollution: volatile organic compounds (VOC) in the air spawns odor while propagating carcinogens if transferred into the human body through the respiratory system. As the material for sensing or removing such hazardous pollutants, MOFs are regarded as one of the highly promising solutions. What is to be underscored here is the infinite possibility of combination of the materials, which are not only capable of being used alone but also of being employed in cooperation with other materials. Kim's research will continue to be centered around mitigating environmental pollution with newly excavated materials. Jeon Chae-yun Photos by Choi Min-ju

2017-02 24

[Academics]Research Institute Expands Cooperation With Africa

Hanyang University Institute for Euro-African Studies recently signed an MOU, the first among domestic universities, with government institutions and universities in Tanzania and Morocco. Hanyang University will support the training of experts in Africa and advancement of Korean SMEs. The Institute signed an MOU with major economic ministries, including Tanzania Trade Development Agency, Tourism and Investment Office, University of Dar es Salaam, and Ardhi University, on May 13th. In particular, the Tourism Authority of Tanzania has decided to appoint Hanyang University Institute for Euro-African Studies as the Korean Goodwill Ambassador to Tanzania. Prior to this, the Institute sought to cooperate with the Ministry of Urban Policy and Development in Morocco last December and signed a MOU with Mohamed V. University of Rabat the capital of Morocco. After the agreement, the Institute joined Nanjing University, China and Meiji University, Japan to co-host the Asia-Africa Cooperation International Conference. The two-way agreement with Tanzania and Moroccan agencies and universities signifies the expansion of their foundations for training regional experts on Africa and opens the way into the African market for small-to-medium Korean enterprises as well as academic exchanges. Kim Sung-soo, a professor in the Department of Political Science and International Studies, said on December 22, "The agreement has an economic significance in addition to academic significance." He added, “The entry of Korean SMEs to Africa will also greatly help Korea's economy. " ▲Prof. Kim Sung-soo

2017-02 20 Important News

[Academics]Redefining Warfare for Cyberspace Battle

Professor Eun. (Photo courtesy of Eun) Since the early 2010s, there have been reports in the media about the rising number of cyberattacks. One of the most notable incidents is the US and Israel's joint cyber assaults at Iran's nuclear facilities using the Stuxnet worm virus. The attacks focused on destroying the operation system of the installations instead of military offense. Hearing this, Professor Eun Yong-soo (Department of Political Science & International Studies) started to question the adaptability of the traditional concept of war to modern cyberattacks. The first Asian to become the editor-in-chief of the Routledge series, "International Relations (IR) Theory and Practice in Asia", Eun specializes in IR theory. His paper, "Cyberwar: Taking Stock of Security and Warfare in the Digital Age" discusses the necessity to reformulate the concept of war in the Information Era. This paper was published in International Studies Perspectives, a SSCI indexed and internationally recognized academic journel of the International Studies Association. According to a German war theorist, Karl Clausewitz, a traditional war is caused with violent means such as destruction, by an institutionalized entity, which has a political purpose to acquire certain values like power or money. Although the concept of cyberwar can be applied to this definition, it is insufficient since there are great disparities between the virtual and the physical world. First, in the case of cyberwar, it is difficult to find who is responsible for the war. "In traditional war, we know who began the attack, and who discharged the missiles. But due to the advance of digital technology, stealthy attacks are possible by circumventing Internet Protocol (IP) addresses," explained Eun. In addition, there may be individuals who serve a government or an institutionalized organization to launch a cyberattack. Second, the damage caused by cyberwar is indirect and comprehensive, whereas harm done by traditional wars occurs directly and instantaneously. If blackout occurs in organizations such as banks and digital network, the entire city becomes disordered, negatively influencing the crime rate and crashing the stock market- and in turn, affecting the whole nation's economy to gradually collapse in the long run. Finally, cyber attacks are much easier to launch than physical assaults. Traditional warfare needs money, and much challenging, as armies need maintaining and weapons have to be launched. Moreover, such attacks are spotted on radar and satellites. By comparison, cyberattacks are carried out with ease. By simple access to the Internet, the whole information network can be destroyed. “There is a concept called 'cyberwar asymmetric paradox'. Although a nation, such as the US and South Korea, boasts high information and communication technology (ICT), its proliferation and reliance means reduced cyberwar strength, because the defense ability is decreased,” Eun specified. This means that the ubiquitous Internet may easily turn many into victims of Information War. Cyberwar asymmetric paradox increases third world countries' motivation to trigger cyberwars. Since they are less subject to shutdowns by cyberattacks due to poor infrastructure, they would remain safe from any damages caused by cyberwars compared to other developed countries. A lower mark in cyber dependence makes a country more dependent. Although the US's cyber offence is stronger than North Korea, the total cyber-strength is weaker due to high cyber dependence and low cyber defence. (Photo courtesy of Eun) “Therefore, there is a need for redefining warfare. The imbalance of power is a significant aspect when analyzing causes of war, since balance of strength may restrain the desire for war. So, when analyzing national power, it is important to consider cyber-strength as an important factor of war along with GDP and military power,” Eun concluded. According to Eun, open social consensus on the extent to calling cyberattack a war is also indispensible, because of its broad and comprehensive damage. This is also significant due to possible cases where hyper securitization can be wrongfully used as a means of acquiring political advantage, labeling every major and minor cyberattack a war. In addition, open discussion, research, and creation of a manual for cyberwar is a necessity particularly in South Korea where despite all the cyberattacks caused by North Korea and high cyber-reliance, there is a lack of academic discussion regarding the issue. Eun explains the need for open discussion and academic research on cyberwar in the modern society. Currently, Eun is planning to develop diverse research theories in the field of international politics. "The theories for academics are typically Western-oriented. They don’t depict our world and its reality," Eun argued. His project is to develop non-Western international political theories. Eun is currently writing a book about the subject, which is called "What is at Stake in Building "Non-Western" International Relations Theory?", and is leading a research project about emotions influencing international politics. "There are a lot of emotional battles going on among Korea, Japan and China. I'm interested in how the collective feelings of a group or a nation affect diplomacy," he said. Turning over conventional ideas and mainstream research methods is what interests Eun, and they usually trigger his research. "Difficulties do arise when you don't follow the mainstream. Yet, I believe that thinking differently is necessary for the development of a society. Even though diverse ideas are not easily accepted, there is a need for people to vocalize thoughts that differ from the mainstream." Eun believes that voicing diverse ideas that differ from the mainstream is important for the development of society. Jang Soo-hyun Photos by Choi Min-ju

2017-02 20 Important News

[Event]2017 Graduation Ceremony at HYU

Before spring approaches, Hanyang University (HYU) students from Seoul and ERICA Campus are getting ready to take a big step outside of Hanyang. In Seoul Campus, total number of students who graduated were 2644, and that of the ERICA Campus were 1688. The 2017 winter graduation ceremony was held at the ERICA Campus on 15th February, and at the Seoul Campus on 16th and 17th. Goodbye Hanyang On the first day of this year's first graduation ceremony, there were a lot of soon-to-be-graduates of HYU along with their family members and friends in front of Aejeemun (Hanyang Station Exit #2) and the Administration Building. Even before the graduation ceremony started, students were taking pictures, celebrating their last day at school. Students pose for pictures with their mates. At 10:30 a.m., graduation ceremonies were held in different colleges, including the College of Engineering, Music, Economics and Finance, and several others. Among all the other colleges in the Seoul Campus, the number of graduates were the highest in the College of Engineering. To accommodate a rough figure of 1100 students, their ceremony was held in the Olympic Gymnasium. On the way to the Olympic Gymnasium, Seoul Campus, there were many witty banners hung around school, congratulating friends. The Olympic Gymnasium was filled with graduates from the College of Engineering. Grand ceremony held on the both campuses At the ERICA Campus, the graduation ceremony of the College of Engineering Sciences was held in the Conference Hall. The lobby was full of graduates and their friends and families. There were juniors from clubs who came along to celebrate the seniors’ graduation. “It's sad to think that I can't see them anymore on campus. We will definitely miss them while we do our club activities,” said Cho Su-min (English Language & Culture, ERICA, 4th year). As the ceremony officially began, graduates all sat in the front row, wearing a blue gown and a graduation cap. Parents, relatives, friends, anyone who came to celebrate students' graduation set at the back. The ceremony began with an opening speech, soon followed by a message given by the President of HYU, Lee Young-moo. President Lee is delivering a speech at the Student Union, ERICA Campus. President Lee first sent greetings to all the people who participated in the ceremony and left advice to graduates who will now head into the wider world. “I want to thank all the professors and parents who have supported students to come all this way to graduation. I am also greatly proud of graduates who endured years of studying. I hope students remain passionate, practice the school motto "Love In Deed", and live their own lives, not that of others." After the words of encouragement, there were award ceremonies on the both campuses, to students with high GPAs and those who set an example, allowing Hanyang's name to shine. “I don't think I deserve this award but I'm glad I got it. My average GPA was 3.75. I tried to not miss class often, which I think allowed me to get this award,” said Yu Hyung-Jae (Composition, ’17). Kim Hun (Architecture, '17), said, “I was taken aback in receiving such a big award. I think that the two years of work as a president of the HYU Chinese students association was taken as a noteworthy achievement." Lee is handing the diploma to a graduating student. After years of being a student After all the ceremonies and the official events ended, more graduates appeared available for interviews. “Among all the years, I remember that sense of isolation I felt when I had just transferred to a new department. It was rough to adjust to the new classes and to get along with new people,” said Jung Yi-jun (Economics and Finance, ’17). Byun Hee-su (Electronic Engineering, '17), added, “I feel much relieved that I am finally graduating and moving on to start a new career outside of school. I am currently working on getting a job and will be concentrating on that." Professor Park Jong-won (Journalism & Mass Communication) said students whom he remembers better are those who didn't actually study very hard. “Not being committed to one's studies isn't necessarily a bad thing. I believe that the students who don't take studying seriously are those who pursue what they truly like. I hope students could form a wider perspective, without being too confined to the rituals of studying.” Byun Hee-su and her family takes a picture after the ceremony with bright smiles on their faces. Parents of graduates seemed proud to see their child finally graduate. The university graduation of sons and daughters must stand as a big event in the parents' lives, too. After taking hundreds of photos, students gradually left the school campus. Now being official graduates of HYU, News H sincerely encourages all graduates to realize their potential in society to the full. Graduates throw their graduation caps high in the air. Yun Ji-hyun Photos by Moon Hana, Kim Youn-soo, Yun Ji-hyun

2017-02 14

[Academics]Transition of PDA Crystals

In the 21st century, nanoscience is coming into the limelight, as more sophisticated technologies are urgently in need to solve crimes or enhance the quality of life. Here is the leader of the Institute of Nano Science and Technology (INST) of Hanyang University- Kim Jong-man, professor at the Department of Chemical Engineering, who is currently leading the field of nanoscience. In the paper “Photoinduced reversible phase transition of azobenzene-containing polydiacetylene crystals,” Kim revealed how an azobenzene-containing supramolecular polydiacetylene (PDA) crystal undergoes a photo-induced reversible red-to-blue phase transition accompanied by crystal tearing. Kim reveals the reversible phase transition that azobenzene-containing PDA crystals undergo. Polydiacetylene, also called as PDA, is an organic polymer that conducts electricity, which is created by the polymerization of substituted diacetylene. PDA is a commonly used compound in the scientific field, considering its multiple applications- from development of organic films to immobilizations of other molecules. Recently, Kim and his research team have found out that when azobenzene, a synthetic crystalline organic compound, is incorporated to PDAs, it showed grand responsiveness to ultraviolet (UV) radiation. “The ultimate goal of this research was to find out what kind of changes the azobenzene-containing PDA crystal undergoes when exposed to UV rays. The result was phenomenal, as crystal tearing was detected in the vulnerable areas of its crystalline structure,” said Kim. Photo-isomerization of azobenzene is a form of light-induced molecular motion, which simply means the compound is capable of absorbing light. When azobenzene is incorporated into PDA crystals, crystal tearing occurred, along with red-to-blue color phase transition between frail crystal structures. These measured up to about 25 degrees in angle. When the UV exposure was removed, the crystalline structure returned to its original state. The video above shows the reversible phase transition of azobenzene-containing PDA crystal, and its crystalline tearing, along with red-blue transition. (Video courtesy of Kim) The graph above shows the angle of crystal tearings when the UV is turned on and off. (Photo courtesy of Kim) “This crystal-tearing phenomenon was a startling finding, because in the beginning, our team only expected color changes, not alternations in the structure. This six month-long experiment proved that light, such as UV rays, can be used as remote controls to regulate nano-compounds,” mentioned Kim. A remote control of nano-particles using lights is called an ‘actuator’, and Kim is hoping to enhance the sophistication of its design based on this experiment. PDA is an intriguing compound, due to its scientifically academic characteristic and practicality. PDAs can bear several colors, mostly red and blue, which is a rare phenomenon found in an organic compound. When certain physical or chemical pressure is applied to PDAs, they usually change their color from red to blue. When the pressure is removed, the color will change back from blue to red, which is called the reversible transition phase. Using this reversibility, Kim discovered various practical applications of PDAs, such as the ‘Forged Gasoline Identification Kit’ or the 'Pore Map', which identifies inherent pore structures. Kim explains various applications of polydiacetylenes. “It is my ultimate goal to develop sensitive sensors using PDAs that can be applied to carbon nanotubes or lung cancer detectors,” added Kim. Carbon nanotubes are allotropes of carbon that are useful in a lot of areas, such as nanotechnology, optics, electronics and material sciences. The lung cancer detector that Kim desires to formulate is designed based on the fact that human breaths consist of about 40 kinds of volatile organic compounds (VOC). Among the VOCs, there is a compound called toluene, which lung cancer patients possess three times more than normal people in their breaths. Based on this, Kim longs to create a kit that can verify whether a test taker is ill or not, just by breathing into the kit. “These practical applications do have restrictions, since the area they are used for are sensitive- economically and security-wise. As a professor, I'm more interested in enhancing the academic foundation of material science, especially PDAs, for the future of nanotechnology,” said Kim. “I want my students and trainees to become scientists, not technicians. While technicians do what they are told to do, scientists ponder upon new ideas and move forward creatively. This approach will allow the futures of our students - including science - to shine.” "Becoming a questioning scientist, instead of a passive technician, is key to the bright future of science." Kim Ju-hyun Photos by Kim Youn-soo

2017-02 06

[Academics][Researcher of the Month] Al-FCG Ready for Action

Professor Sun Yang-guk of the Department of Energy Engineering is February’s Researcher of the Month for his active role in exploring the field of energy engineering. In his paper, “Compositionally Graded Cathode Material with Long-Term Cycling Stability for Electric Vehicles Application”, Sun explains how adding aluminum into the cathode makes batteries last longer and become more stable compared to other rates of composition. The Al-FCG61 that Sun has developed has shown a high rate of energy efficiency even at 100% depth of discharge (DOD), which draws attention in the field. Sun explains his research with assisted diagrams. As the supply and demand of the electric vehicle is on the rise, most of the batteries in the market last from 150km to 400km, meaning that once the battery is fully charged, the car would move between the distance within. What accounts for the difference is the capacity as to how much cathode can hold up. In order for cars to go beyond 300km at least, the capacity of the cathode would have to be over 200A/h. The only problem to this is that it gets difficult to make it stable and it could blow up. There are various prototypes ranging from generation 1 to generation 4 and the study carried out in Sun's paper is on generation 3. Gradients of different components from inner to outer parts of nickel particle. (Photo courtesy of Sun) Capacity retention, which is the lifespan of a battery, would rise with 61% of nickel with FCG full concentration gradient, which is what Sun has developed in order to create a more stable and long-lasting battery that would hold a larger capacity. Within the mold, Sun has created a two-way particle that contains a high percentage of nickel inside with lower percentage of nickel on the outside. This concentration gradient is created due to the fact that nickel has its advantage of being able to increase the capacity of the battery while it makes the battery more unstable with exothermic reaction. Along with the nickel, Sun has increased the percentage of the manganese inside the particle since it has the advantage of making the cathode more stable. Depth of discharge (DOD) is the rate at which battery is either charged 60% or 100%, and this is tested before electric vehicles are sold for inspection. The average usage of an electric vehicle is at around 2,500 cycles for 10 years, and the Al-FCG has proven to be more energy efficient even at 100%. Most of the batteries do not last long at DOD100 due to the expansion of volume inside the battery. This means that the battery would lose its efficiency as time goes. Al-FCG has shown its Coulombic efficiency rate of 84.5% even at DOD100, while batteries currently in the market show an average of 50% at 2000 cycles. This new battery devised by Sun is not only more energy efficient, but more cost efficient as well. Sun wishes to make more efficient batteries. Sun is continuously researching to keep the DOD level at 100% even after 2000 cycles. With his findings, the electric vehicle industry would definitely benefit hugely in terms of cost and energy efficiency. With different materials, Sun wishes to develop other types of batteries that would bring more comfort to society. Kim Seung-jun Photos by Kim Youn-soo