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- Simultaneous control of multiple ferromagnetic materials 'ferroelectricity and ferromagnetism'
- Korea Research Foundation, "Improving the applicability of next-generation electronic devices" △ From left, prof. Ji Young Jo of Gwangju Institute of Science and Technology, prof. Sung Soo Lee, prof. Young Min Kim of Sungkyunkwan University. The Korea Research Foundation (KFRI) announced on the 8th that the research team of Gwangju Institute of Science and Technology and Professor Kim Sung-gyun of the Sungkyunkwan University research team identified the principle of ferroelectricity and ferromagnetism at the same time. Multiple stiffness refers to a property having both ferroelectric and ferromagnetic properties. Ferroelectric materials that form the electric field are used in computer memory chips, capacitors, and the like. In the case of magnetic ferromagnetic materials, it is mainly used for ahrd disk magnetic heads and electric appliances motors. Now it is not easy to control both properties at the same time. The team has artificially controlled the oxygen atom position of the bismuth cetylsulphide film, which is a multi-stiff material, and has exceeded its limit. In addition, by developing high-quality thin film manufacturing technology, we have increased the thickness of thin film that can control oxygen atom position by more than 10 times. As a result, the ferroelectricity and ferromagnetic properties have improved by more than two times compared to conventional devices, the researchers said. Prof. Jo said, "Until now, it was possible to control the position of oxygen atoms only in the interface area of less than a few nanometers. It was difficult to measure ferroelectricity and ferromagneticity." she said. Tae Young Choi of Pohang Accelerator Research Institute, prof. Yoon Seok Kim, prof. Byung Ki Jo of Gwangju Institute of Science and Technology, and prof. Junhee Lee of Ulsan Institute of Science and Technology are supported research. The paper on the achievements was published on the cover of Advanced Funtional Materials on 26th of last month.
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- 작성일 2018-04-09
- 조회수 2607
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- Professor Oh Sang-ho succeeded in verifying electron distribution through a microscope
- Professor Oh Sang-ho (SKKU Energy Science dept.) succeeded in verifying electron distribution through a microscope Successful verification of electron distribution by microscope ... "Application to Interface Electron Characterization" △ Dimensional electromagnetic gas in which the crystal orientation is formed at an oxide interface different from the crystal orientation. When the crystal orientation of the LaAlO3 / SrTiO3 oxide controlled at the atomic unit is changed from (001) to (111), the distribution width of the two-dimensional electron gas widenes from about 1 nm to 3 nm. In order to image the change in the electron distribution due to the quantum phenomenon, a microscopic observation method which is sensitive to electrons and has excellent spatial resolution is needed. Sungkyunkwan University Professor Oh Sang-ho and Dr. Song Kyung Materials Research Institute team have succeeded in observing two-dimensional electron gas under a microscope. The precise control of electron quantity to form at a desired location or to move quickly is closely related to the performance of semiconductor memory devices. Therefore, to control the elcetrons effectively, high-resolution microscopic observation methods are needed to visually verify and anlayze the theoretically predicted electron distribution. Using inline electronic holography with high sensitivity, the research team developed a visual inspection of two-dimensional electron gas formed between two oxides (LaAlO3 / SrTiO3). The two-dimensional electron gas refers to a conductive electron bunch formed at the interface between two materials. Signals are weak to observe with an electron microscope. Several variable effects should also be considered. △ A conceptual diagram of inline electron holography method applied to oxide interface where two - dimensional electron gas exists. The team analyzed the inherent properties of the two-dimensional electron gas by accurately calibrating all the variable factors. Based on this, it was confirmed that the distribution and the density of the two-dimensional electron gas are finely changed according to the crystal orientation (the angle and direction in which the atoms are bonded).The researchers explained that the quantum phenomenon occurs because the electron energy level changes according to the direction of observation. Professor Oh Sang-ho said, "It is the first observation of electron distribution and density change caused by various quantum phenomena, and it can be used to analyze the surface and interfacial electron characteristics described in the physical theory." The research was carried out by the Ministry of Science and Technology, Ministry of Information and Communication, the Korea Research Foundation, the Future Material Discovery Project, the Basic Research Project (Advanced Research), and the US Air Force Asia Office (AOARD). The paper on the achievements was published in the March issue of Nature Nanotechnology.
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- 작성일 2018-04-02
- 조회수 2801
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- Developed 'Gel' to prevent cancer metastasis and recurrence
- Korea-US joint researcher development. It can treat cancer without side effects. Korean scientists have developed a biologically friendly 'hydrogel' that prevents recurrence and metastasis after cancer removal surgery. Professor Park Chun-Kwon(Sungkyunkwan Univ.) and Professor Michael Goldberg(Harvard Univ.) said that they succeeded in preventing cancer recurrence by delivering immunity-enhancing drugs to the surgical site of the tumor that removed the tumor. As the hydrogel containing the drug is not toxic to the human body, the researchers plan to start clinical trials soon. The results of the study were published in the International Journal of Science 'Intermediary Medicine' which links basic medicine and clinical researchers. It is known that 40% of patients who have undergone surgery through surgery have recurred within 5 years. Even if the entire tumor is roved, it is common for a small number of tumor cells to remain in the surgical site. Professor Park Chun-Kwon said, "After the cancer removal surgery, temporary immune decay occurs during the recovery process, and residual cancer cells may be metastasized or cancer cell growth may be stimulated". Also Professor explained that "Cancer recurrence and metastasis remain as important as cancer-related deaths of more thant 90%" The researchers used hyaluronic acid, a sugar ingredient in the body, to make a 1.2-cm-diameter gel that dissolves in the body and disappears. This gel contains immunity-enhancing drugs and is delivered locally to the surgical site for a long time. Through these systems, 'natural killer cells' and 'dendritic cells', which correspond to innate immunity, rapidly remove the cells that have invaded the body, such as cancer cells, and disease, thereby promoting acquired immunity. The researchers removed the tumors from mice with breast cancer and lung cancer and transplanted a hydrogel deveolped on the spot. Professor Park Chun-Kwon said, "When the tumor is surgically removed, beneficial immune cells protecting the body are often removed. A drug that strengthens the immune system in the gel enhances the immunity of the surgical site and can remove cancer from the remaining cancer cells." The researchers observed for 12 weeks that the hydrogel-loaded mice had a very high survival rate compared with the non-treated mice, and the cancer did not recur. This was significantly higher than the conventional intravenous administration method. In addition, there was no toxicity in liver, kidney, blood cells, including weight change. The researchers evaluated the study as providing a new basis for tumor therapy as it can increase the success rate for cancer patients. Professor Park Chun-Kwon added, "Both hydrogels and durgs are non-toxic to humans and have excellent tumor-treatment effects, so the future plan is to apply them to patients through clinical trials." △ Professor, Park Chun-Kwon △ The appearance of the gel developed by the researchers.
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- 작성일 2018-03-26
- 조회수 2640
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- Traditional and Unique Freshman Orientation, 'Shin Bang Rye' was held
- To welcome the new semester of 2018, 250 freshmen, including international students, participated in SKKU’s traditional and unique orientation ‘Shin Bang Rye’, held at the Humanities and Social Sciences Campus from March 10th ~ 11th. ‘Shin Bang Rye’ is a traditional freshmen orientation stemming from the Joseon Dynasty, where newcomers can learn about the education curriculum, campus life, and expected behavior. The event that commenced during the ‘Shin Bang Rye’ ritual process are as follows: Al-Sung (commemorative rites in front of Dae-Sung-Jun), Sang-Eup-Rye (formal greetings between seniors and freshman students), Shin-Bang-Rye (welcoming party by sharing food), and Myun-Shin-Rye (initiation ceremony where senior students provides various tasks to freshmen). For 2018 Shin Bang Rye, 27 international students from various countries, including China, France, Morocco, Germany, Czech Republic, Vietnam, etc. participated to experience the culture and history of the Joseon Dynasty. “We tried to make a unique orientation by combining traditional and modern environments. We will continuously try our best to organize special and unique events with novel ideas,” said student Min Gyung OH, president of the student association ‘Chung Ryang’.
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- 작성일 2018-03-21
- 조회수 2357
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- University College held 'Peer Leader Workshop 2018'
- The SKKU University College (Dean: Hong Joon YOO) held their ‘Peer Leader Workshop 2018’ on March 15th (Fri) at the 600th Anniversary Hall in the Humanities and Social Sciences campus. At the event, a total of 110 people participated, including 4 ‘Peer Leaders (PL)’ of the Learning Community (LC), freshmen entering in 2018, and Sungkyun mentors from both the Seoul and Suwon Campuses. It began with an introduction of the event from a Sungkyun mentor and a welcome address from the dean, followed by a PL appointment certificate conferment ceremony, experience sharing, team projects by PL groups, and mentoring between Sungkyun mentors and PL students. Eun Hye KIM, a representative of PL, said, “It is a great honor for me to receive this PL appointment certificate as a representative of PL. I will work hard to become like senior students who came to share their experience and stories. Lastly, thank you all Sungkyun mentors and people who prepared this event.” The Peer Leader Workshop by the University College aims to develop the leadership of freshmen, to strengthen companionship, and to broaden exchange opportunities between the Seoul and Suwon campuses.
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- 작성일 2018-03-21
- 조회수 2395
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- Info Session for Data Science Fusion Dept. was held
- Information session for Data Science Fusion Dept. was held on 24th Jan. The following topics have been covered. 1. Opening Friday Class - Open the curriculum to refelct students' needs - Class name : Artificial Intelligence / Time : Fri. 18:30 ~ 21:30 - More details will be decided next week. 2. Advisor Prof. Assignment 1) How to apply Advisor Prof. - For full-time students who want to sutdy deeply, please contact with professors in advance - If you wish to study full-time, as usual general graduate students, you will be in the lab every day and carry out projects and research - Selection of advisor prof. is mandatory for students in the thesis track 3. Capstone project Class - Designate student's interests and conduct projects with professors - Project topic selection and research are carried out, and results are evaluated by the advisor - More detailed criteria will be announced later 4. Student Activity - Stud group organization and activities will be supported depending on the results of activities in the department - Student Council would be organized - Student online community would be operate (by using google) 5. Department Students' Lounge - Business Hall B1F, 33B102 (Time : Fri. 17:30 ~ 18:30, Sat. 11:00 ~ 17:00)
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- 작성일 2018-02-28
- 조회수 2557
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- [Seminar] Prof. Luke P. Lee, UC Berkeley
- Institute for Basic Science(IBS) Center for Intergrated Nanostructure Physics(CINAP) and Center for Neuroscience Imaging Research(CNIR) will invite a special guest: Prof. Luke P. Lee for seminar which will be held as below: ● Speaker : Prof. Luke P. Lee Departments of Bioengineering, Electrical Engineering & Computer Science, and Biophysics Program, Berkeley Sensor and Actuator Center, UC Berkeley Biomedical Institute for Global Health Research & Technology (BIGHEART), NUS, Singapore ● Title : " Quantum Biological Electron Transfer and Its Applications in Life Sciences and Medicine" ● Date & Time : Feb.21, 2018 (Wed), 11:00 AM ● Place : Auditorium of Samsung Library, Natural Science Campus We would like to kindly invite all of you to attend the seminar. CINAP(Center for Integrated Nanostructure Physics): http://cinap.ibs.re.kr/html/cinap_en/ CNIR(Center for Neuroscience Imaging Research): http://cnir.ibs.re.kr/html/cnir_en/
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- 작성일 2018-02-20
- 조회수 2336
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- SKKU Research Team, "Discover possibility of high performance electric car battery development"
- "It would be helpful to develop electric car battery that travels 400km in one charge" Sungkyunkwan University prof. Yoon Won-Seop(left), Lee Won-Tae researcher(right). Sungkyunkwan University researchers have discovered the possibility of developing a high-performance battery that can travel up to 400km with a single charge. Sungkyunkwan University announced on the 14th that the team of Professor Yoon Won-Seop of the Department of Energy Science(DOES) discovered a key factor breaking the existing stereotypes in studying the characteristics of nickel anode material, which is one of battery core elements of electric car battery. As the elemental content of nickel increases, the size of the migration path of lithium ions increases and the number of cationic subunits that interfere with lithium migration also decreases. It would be big help to discover high energy material development.\ In the existing academic world, there was a thought that as the nickel content increased, the properties of the crystal structure would be adversely affedted. However, the researchers found that the performance was actually improved. Sungkyunkwan University explained, "We have discovered the possibility of designing a material capable of high-speed charging and discharging at the atomic level." When the results of this study are applied, it is possible to develop a high-density battery that travels for 400km on an electric charge. The research team's paper(New Insight into Ni-Rich Layered Structure for Next-Generation Li Rechargeable Batteries)was selected as a cover paper for 'Advanced Energy Materials', a world-renowned journal in the field of materials science.
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- 작성일 2018-02-20
- 조회수 2280
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- [Research News] Discovery of a tellurium-catalyzed catalyst for monolayer disulfide transition metal
- Discovery of a tellurium-catalyzed catalyst for monolayer disulfide transition metal Center for Integrated Nanostructure Physics(CINP) succeeded in develping a method of replacing sulfur of monolayer molybdenum disulfide synthesized by chemical vapor deposition with tellurium and converting it into iturium and molybdenum. In order to induce such a substitution reaction, a reaction at a high temperature is required. Since the metals of the tellurium transition metal have low thermal stability, there is a problem that the MoTe2 material becomes unstable when the MoS2 is substituted with MoTe2. MoTe2, which is the product after substitution, is thermally unstable at about 700 ° C and vaporizes. The difficulty is that the substitution reaction does not occur at temperatures below 700 ° C. To solve this problem, introduction of sodium tellurium (Na2Te), which is a tellurium catalyst, resulted in a substitution reaction even at low temperature (less than 700 ° C) and a stable phase of MoTe2 was obtained. The team found that the tellurium-substitution reaction takes precedence over the edge of the MoS2 crystal, which could be used to make a hetero semiconductor junction (MoS2-MoTe2). Various conditions (MoS2-xTex alloy, semiconducting 2H-MoTe2, and metallic 1T'-MoTe2) were obtained by controlling experimental conditions. It is also shown that the composition of MoS2-xTex alloy can be controlled to control its band gap. Dr. Yoon Seok-joon, who led the study, predicted that even if the compound is actually unstable, it is possible to synthesize the compound using this substitution method, and to synthesize the compound that does not exist in nature. This research results were published on December 18 in Nature Communications(IF 12.124), a worldwide scientific journal in science and technology.
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- 작성일 2018-01-24
- 조회수 2296
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- [SKKUZINE] 'Visiting the LAB' - Prof. Min Ah SUH's lab
- The lab of Prof. SUH, Min Ah, who is the head of the Department of Global Biomedical Engineering, was introduced at the 'Visiting the Laboratory' section of Sungkyun Webzine 387. Below is an interview with a graduate school student. (https://www.skkuzine.com/Culture/category/18) Q) How did you decide to go on to graduate school? : I majored in double majoring in Psychology, which I had wanted to do since I entered the Life Science Department. I wanted to study differently from class while listening to my undergraduate major. I am interested in how our brain works and I am interested in biological apporoach. So I entered to Professor SUH, Min Ah's lab as an ungraduate student. I decided to go on to graduate school by seeing how I could study and study in an environment where I could freely experiment. I thought that I could study and experiment more deeply about the brain science field than the department study and to think about utilize the learned knowledge comprehensively. Q) Is there any economic difficulty in graduate school tuition? : How much I can afford is one of the biggest problems when I consider graduate study. Depending on the laboratory or department, graduate students may have different financial support. For example, there are a variety of support programs for graduate students, such as the scholarship supported by the school, or the scholarship training program BK21. Especially, there is a Global Doctoral Training Program(GPF), which provides $30,000 every year. GPF programs are very competitive, but they can receive a wide range of support from schools and many graduate students are selected each year with excellent guidance from proffessors. In addition, I have various support programs to devote myself to research, so I think that if I study well and go to school, I can solve some economic difficulties. Q) What is the best point of our lab? : The best part of our lab is that you can use cutting-edge experimental equipment. Two-Photon microscope and STED microscope enable microvessel contraction and relaxation and neuron activity to be observed at the cellular level in vivo. Brain samples can be used to precisely observe changes in the brain through histology after the experiment. In addition, there are in vivo optical imaging equipment, Calcium imaging equipment, and Neural recording equipment, which are ideal for studying the blood vessels and neurons. Q) Are your lab students good with the professor? : Our lab is a place where professors, graduate students, and undergraduate students are actively engaged in research without the wall. A list of speakers is set up every week, and all the members gather to conduct in-depth research meetings and have time to meet one-on-one with the professor and discuss the progress of the research. Through this process, you will discuss your research and develop a critical perspective. This is a great way to develop your ability to conduct independent research. In addition, we receive various feedbacks, and it becomes impetus to proceed research.
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- 작성일 2018-01-18
- 조회수 2907