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2017-08 15

[Academics]Upgrading Transcriptome Map

Incredible amount of transcriptomes encoded by eukaryotic genomes has been produced as RNA-sequencing reads are published in piles. The transcriptome is the sum of all RNA information contained in a body’s cells, which is an indispensable data when creating the transcriptome map of the body. The current map, however, is not its apotheosis since it was constructed based on RNA-seq reads that lack their orientations and certain boundary information. In his paper “High-confidence coding and noncoding transcriptome,” Professor Nam Jin-wu of Department of Life Science has presented the transcriptome map with RNA-seq reads with high accuracy and efficiency. “What makes this research valuable is its contribution to the scientific community. It will function as an indispensable infrastructure.” RNA and the map In the past 10 years, with the technology of next generation sequencing (NGO), data of individual’s genome and transcriptome has been developing at a rapid pace. Genetic information of both healthy and diseased individuals aggregates to approximately 10 peta bytes from all over the world, from which Nam focused specifically on analyzing the transcriptome, disregarding the genome for the moment. A critical difference between the two is that genome has orientation while transcriptome lacks it. This indicates that it would be extremely difficult and inconvenient to arrange the little pieces of information to form the whole genetic map of transcriptome. “What it means by ‘lack of orientation’ is, simply picture this situation: putting batteries in a remote control which has no plus or minus indicators. You would have to find the right direction by just trying. It is also like jigsaw puzzles where you have to search thoroughly the scattered pieces and find and put the right ones together until you get the whole picture,” explained Nam. Constructing a genetic map with orderless pieces of information could be an arduous task, since the massive bio-big data offers a tremendous amount of genetic information and they lack orientation. What Nam has created through his research is an algorithm that predetermines the orientation and boundaries of transcripts and genetic information. This will not only lessen the work of constructing the transcriptome map by assembling RNA-seq reads that lack orientation but also increase the accuracy and quality of the resulting maps. The outcome of his research, in a word, orients the directionless RNA-seq reads and locate them where they belong. Now with the more accurate and systematic transcriptome map, the amount and structure of RNA in a cell in the body could be figured. Nam first started this research three years ago, spending the first two years constructing the algorithm and spending the last year producing data using NGS. He is currently researching on the noncoding RNA (RNA that does not produce protein), which is highly related with various types of cancer and other rare diseases. The ultimate goal of Nam’s studies is to solve the mystery of unexplored RNA. 98% of RNA in human body belongs to the noncoding category, so how exactly do they affect the way a human being is and how do they account for different anomalies? “A good question begets a good study.” Jeon Chae-yun chaeyun111@hanyang.ac.kr Photos by Choi Min-ju

2017-08 08

[Academics]Founding Father of the Pragmatic Application of Stepping Motors

Every moving object needs a power plant. In the industrial world, permanent magnet stepper motors are widely used, which are designed with permanent motor (PM) rotors that are commanded by electrical pulses. In his paper “Nonlinear H2 Control for a Nonlinear System with Bounded Varying Parameters: Application to PM Stepper Motors,” Chung proposes a new nonlinear H2 controller for the PM motors that can increase the efficiency both in its speed and practicality. Chung is the pioneer in South Korea to discover new methods of applying nonlinear H2 control for a nonlinear system. Utilization of the PM motors vary from household purposes such as printers to industrial purposes such as gas systems and cars. Since its earlier usage from the 1970s, these motors have thrown questions to scientists and engineers on its formula. “Despite the fact that these motors are popularized in the industry, there are constraints in the PM motors, such as speed restriction,” said Chung. To solve this problem, engineers have discovered the DQ (direct quadrature) transformation of the motors which is a tensor that rotates the reference frame of a element vector matrix to simplify the analysis of it. “My research team has found that DQ is comparatively inefficient in terms of energy saving and cost control. Thus, we detected a new mathematical method to replace the DQ transformation,” said Chung. Often times, engineers used the linear system to control the PM motors. A linear motor is an electric motor that has its stator and rotor unrolled, so that instead of producing a torque, it produces a linear force along its length. However, linear motors are not necessarily straight, which causes restrictions in speed. “Formula of the linear system consists of homogeneity and additivity, and the main point of our research was to minimize the relationship between them using the H2 control system,” emphasized Chung. This FOC (Field Oriented Control) with the H2 system went through an experiment with other traditional methods for a comparison. “The results were outstanding as more simplified version of mathematical calculation and less usage of sensors beforehand were required, while the tracking errors and energy cost were reduced respectively,” said Chung. The green line of case 3, which uses the FOC (Field Orientation Control) of the H2 control shows the extreme distinction in tracking errors. (Photo courtesy of Chung) The most desired application of this method is on the intelligence vehicle, which is a car that can drive by itself without any interference of a driver. “Learning about the motion control, which is the main issue of my paper, is the most important criteria of designing a self-driving vehicle. This study allowed me to grow this industry rapidly in five years,” astonished Chung. Currently, Chung’s research lab for the intelligence vehicle based on motion control is the best in Korea which acquire all the knowledge on the sensors, actuators, and control algorithms. Chung’s passion for science was conspicuous from the days he used to make a radio on his own. When he started gaining interests in engineering, motion control grabbed his sight. “The stepping motors and their control system are fundamental technologies. I thought that developing them into pragmatic applications would be exciting,” reminisced Chung. Currently, Chung is passionately contributing to the scientific and technological advancement. For the visible result, he had launched the IEEE (Institute of Electrical and Electronics Engineers) ‘s CDC (Conference on Decision and Control) conference at Jeju Island, South Korea. “This is the first time ever that the CDC conference is being held in South Korea and I consider this the greatest achievement of my academic life so far,” smiled Chung. Chung is currently working on developing more advanced intelligence vehicles. Chung’s everlasting hope for his students is that they could study both science and liberal arts. “I wish South Korean educational system could teach students to embrace the joy of learning. This will eventually rear the bright sprouts of Korea,” said Chung. Kim Ju-hyun kimster9421@hanyang.ac.kr Photos by Choi Min-ju

2017-08 07

[Culture]Apps You Need in Your Life

Kakao Talk, Jihachul, Naver Map, Seoul Bus, Naver Dictionary, Candy Camera, Snow, Melon, Kakao Taxi, and various coffee shop stamp apps are all typical applications found in an ordinary korean’s smartphone. These apps are common yet indispensable to the extent that they have become a big part of people’s daily lives in Korea. Besides these everyday applications, what are some fun, genius apps worth downloading? From left to right, Date Pop, Seoul Travel, Albamon, People of Delivery, and Zigzag. (Photo courtesy of play.google.com) Brilliant and convenient First things first, for those who love to visit new places, either one of these two applications are highly recommended: Date Pop or Seoul Travel. These applications are more than just handy when looking for some fun places to hang out with friends and lovers or when finding appetizing cafes or restaurants. From location, menu, price and reviews, the apps provide much information and works as the encyclopedia of enjoyment. Creation of such applications has motivated a win-win situation for both users and business owners. People can gain fun and convenient information with just a few taps on their smartphone screen while the app functions as a great loudspeaker for the restaurant and cafe owners. By providing wandering roamers with countless options for their destination, the app has become a great mean of advertisement and a plan maker at the same time. Click the region you want to go and see where you want to visit. (Photo courtesy of achimjuice.tistory.com) Price, location, and menu are all listed in Seoul Travel. (Photo courtesy of app.chosun.com) When looking for an alba, or part-time jobs, there is nothing more helpful than the app Albamon. If Date Pop and Seoul Travel are the mobile books of fun places, Albamon is the one for people looking for part-time jobs. The app displays countless employment notice from myriad of companies, restaurants, cafes, stores, and more. Jobs can be funneled by one's setting according to his or her categories such as payment, location, working time, and age requirements. With the right setting, finding a perfect fitting alba for one is not a tricky task anymore. It is an useful app to anyone who is looking for all kinds of part-time jobs. Detailed, comprehensive, and individual-tailored part-time job information are provided. (Photo courtesy of appannie.com) There is nothing more convenient than having one's food delivered when there is no time and energy to cook or go out to eat but hunger is demanding some action. In such situation, People of Delivery is the perfect app to satisfy hunger’s demand. Korea’s delivery service is something that exceeds the level of mere convenience but something that has developed into a huge part of its culture—even McDonalds is delivered. Fitting to the title, this app is the phonebook of all menus in Korea, since virtually all the menus are listed in the app and they are all ready to be delivered. Making the app more convenient, the categorization according to menu and franchised restaurants enables easy scanning for indecisive customers. According to menu and franchised restaurants, categories are made. (Photo courtesy of estimastory.com) Even online shopping can be an easier task with a mobile app. Zigzag is urgent to download for lazy shopaholics or thrifty shoppers. This application is the ultimate compilation of numerous online shopping malls, having the excellent function of gathering and presenting a particular item from different malls and allowing the shopper to compare the price at one sight. The app allows the shopper to find the item or fashion he or she is looking for and buy it at its best price. Enter the category of clothing, look through the list of online shopping malls, and compare the price are all it takes to purchase the exact item one wants at the most affordable price. Styles, price and items can be seen in one sight. (Photo courtesy of simsimha3.tistory.com) Jeon Chae-yun chaeyun111@hanyang.ac.kr

2017-08 05

[Event]High School Students Experience Medical Services

Early in the morning on 29th of July, 51 students from seven different high schools in Seongdong district gathered at Hanyang University (HYU) Hospital for a special reason. Medical Top Seongdong (MTS) program has been held since last year by Seongdong District Office along with HYU, HYU Hospital, Seoul Dental Hospital, and Jein Medical Hospital as they have held the MOU on March 31st, 2016 promising a better medical service and education towards Seongdong district inhabitants. How the program went Students were divided into three different teams, mostly consisted of students from same schools, and were taken to five different places in the hospital: Department of Gastrointestinal Internal Medicine, Radiology, Pathology, Pediatrics, and emergency medical center. Each department provided short lectures to students for around 20 minutes. News H joined team 2 to take a deeper look into the program. Team 2 listening to the short lecture of professor Kim Jae-ha. Starting off with the emergency medical center, Jo yong-il professor was there to provide an insight about the difficult tasks that he has to face each day. “Since we have to take care of the most vital moments of patients, it is sometimes heartbreaking but we try to do our best to give them a proper treatment,” commented Jo. Afterwards, students were taken to the Department of Pathology led by Hwang yoon-shin director where she has shown the students enucleated womb and lung. “I felt the necessity to show the students the body parts with cancer to teach them how it is important to maintain good health of their body,” explained Hwang. This was the department that students showed most interest as cancer cells could be seen through their very own eyes with microscope. Then, the team moved onto the Radiology department to learn about the X-ray machines, CT scanners and MRI machines and how they works. Nam Dong-hyun (Duksoo High School) had a chance to experience what it was like to lie inside a CT scanner. “The machine made so much noise which almost made me freak out but I think it was a fun experience,” said Nam. Moving onto the Department of Gastrointestinal Internal Medicine, Kim Jae-ha professor explained about endoscope procedures and had a question and answer session. For the last part of the program, students moved to the Department of Pediatrics to learn about the school within HYU Hospital that provides education for young patients who need to stay inside the hospital for a long period of time. Nam is experiencing what it is like to go inside a CT scanner. Dreams to bear the fruit The program itself was created last year since there has been no programs that allowed high school students to actually exercise practical knowledge on medical field. The curriculum itself has upgraded since HYU Hospital was able to provide a better environment compared to last year. Emergency medical center has been set up and in terms of safety for both the patients and the students, the courses have been set up to avoid contact on each sides. Since it was a program designed for those who were interested in working in the medical field, students were satisfied with the program. Lee jae-eun (Gyeongil High School) who wanted to become a doctor with the influence of her uncle was overwhelmed by the facility. “Since it is a hospital at the university, I was able to see and experience more things and I became more interested in this field,” commented Lee. It was not only Lee who was quite satisfied with the program. Kim beom-jun (Duksoo High School) was also motivated to study harder to become a member of the hospital. “I have always wanted to become a rescuer and this trip gave me more confidence to achieve my dream. Saving lives seems to be the right path for me,” added Kim. On the other hand, some students commented how they wished to visit more departments as only five of the departments was included in the whole hospital due to the time limits and safety issues. “I wanted to take a look at the ophthalmic clinic but it was a little disappointed that it was not on the list. The program itself was of great help to me,” added Yoo seong-min (Seongsu High School). Students and faculty members all pleased with the program. Students being able to spread their wings and take a step closer towards their dreams is a great development for the society as a whole. Seongdong district and HYU, along with HYU Hospital being the leading teachers for high school students is a great sign. It would be great to expect students with dreams of working in the medical field to grow up as who they want to be and contribute the society. Kim Seung-jun nzdave94@hanyang.ac.kr Photos by Kim Youn-soo

2017-07 30

[Academics][Researcher of the Month] World Class Solar Cell Developed

Professor Kim Eun-kyu of the Department of Physics is July’s Researcher of the Month for his active role in spreading knowledge in the field of physics. In his paper, “Iodide management in formamidinium-lead-halide-based perovskite layers for efficient solar cells”, Kim explains how he has created the ‘perovskite solar battery’ with the best efficiency in the world. Perovskite batteries have high efficiency and low production cost which is how it is gaining interest for the next generation solar energy source. Kim is explaining about the perovskite solar battery. Perovskite is material created out of anion, cation, and halide and is used inside the solar battery to create electricity. Kim has carried out his study along with Ulsan National Institute of Science Technology (UNIST) and Korea Research Institute of Chemical Technology (KRICT) and the paper has been introduced in the world renowned academic journal, Science. The research has been carried out through the support of Ministry of Science, ICT and Future Planning. The key theme of the research has been that through the control of halide, efficiency was to be raised from 20.0% to 22.1%. Currently, solar batteries are created with silicon materials but with the newly developed technology, new solar batteries could produce the highest efficiency with half the cost. Not only could it be used in the solar batteries, but they could also be used to produce new and renewable energy in the future with further integration of different technologies. Graphs showing the efficiency of the solar battery at 22.1% (Photo courtesy of Kim) Kim has started this study since all types of batteries should implement high level of efficiency. With high efficiency follows the lower production cost which was why this was important for the commercialization of the solar battery field. Kim and his research team are the best in the field currently showing the highest level of efficiency and still working for better technology. Although the technology itself has been developed to produce the most efficient solar batteries, mass production and commercialization problem is yet to be solved. Kim and his team are currently working on the perovskite battery to further test its safety and to control the halide. Although Kim and his research team have already reached their goal of creating the efficient battery and printing their paper on Science, further studies will be carried out to make the lives more convenient for people. Kim wishes to develop a more efficient solar battery in the future. Kim Seung-jun nzdave94@hanyang.ac.kr Photos by Kim Youn-soo

2017-07 24

[Student]First Try, Best Result!

To foster future leaders of unfolding automobiles market and self-driving cars, Hanyang University (HYU) hosted its 15th Smart Model Car Competition at the Olympic Gymnasium on the 14th of July. Applause of encouragement and cheers were heard here and there with shout outs of supports being made each time a team took their turn to run their cars. Of the 20 teams that made it to the final, team Future Automotive Engineering (FAE) won the first place. All five members of the team are students of the Department of Automotive Engineering: Park Sung-woo (4th year), Shin Hyun-ki (4th year), Park Soo-hyun (4th year), Byun Hyo-seok (2nd year), and Byeon Moo-kyung (4th year). Participants were required to develop an embedded control system (a smart computer system enabling machines to operate on their own) and run their cars on the track, which was readily set in the Olympic Gymnasium, waiting for the entrants to come. Each team was to bring their cars to the start line and present its ability when called upon. The missions were as follows: cars must drive in the middle of the lane, must avoid obstacles, must speed down in the school zone and go back to the original speed after leaving the zone, should be able to go over the hill, and must make curves without departing the lane. Now, ready, set, go! The finished work of team FAE, the only one to complete the whole track. (Photo courtesy of FAE) Prize of 10,000,000 given to team FAE! Unforeseen and unforgettable “None of us expected to win the competition. Since all five of us has no experience of participating in a contest like this, we thought we would barely make it to the final,” began Byun. About 100 teams were present for the preliminary round, after which 20 teams were selected for the final. Much to their surprise, when team FAE passed the preliminary round ranking the 4th place, their goal changed to complete the track and make it to the finish line in the final. What was surprising was not only the fact that they have won the competition but also that they were the only team who made it to the finish line. “We were happy with the result, of course, but at the same time, we were quite shook from such unexpected outcome. We didn’t expect to be the only team to complete the track,” remarked Byun. The most essential requisite for the car was to keep itself in the middle of the lane, not crossing over to the other or departing it. When the car was free to drive, it had to maintain its speed and make curves as the track demanded. Then at some point, school zone was marked by thick, black lines in which the car had to slow down and avoid the obstacles. Marking the end of the school zone with another set of thick black lines, the car was to go back to its original speed and finish the track, passing a hill and stopping at the finish line without bumping into the blockage. FAE’s car has successfully fulfilled all these requirements and confidently marched to the end. Sung-woo, who was the team leader, was looking for fellow students who would join his team. The members came together as one team through acquaintance, since they took the same course. The team first gathered around April, in the middle of the semester, and met up from time to time to work on their automobile. It was after the semester was over that they deeply got down to their business and invested more time on constructing the car. They even got access to the 3D printer thanks to professor Yoon Soo-kyung and tested their designs, by mapping out where each part should lie. Nonetheless, they received no particular help from any of their professors to be fair. “This course named 'Microprocessor' we took was quite helpful in a way that it taught us about the parts we used for this competition.” Byeon Moo-kyung (left), Byeon Hyo-seok (middle), Park Soo-hyun (right) Fix it till you make it “Finding the right angle of the camera, which will be the eye of the car, was one of the most difficult tasks,” recalled Park. It was crucial to adjust the camera at the perfect angle because the car has to sense and move according to what it observes. If it is too short-sighted, the car will fail to perceive the other lane and if it is too far-sighted, the car will easily depart the lane. “We had to remove and adjust the camera countless times to find the perfect spot. Everything will go into nothing if the camera fails to observe the area correctly in the first place,” explained Byeon. In addition, more than ten parts had to be replaced because they were burned during the process. If one part goes wrong, the whole thing fails to function. Therefore, it was crucial that each part maintained its good condition. Overall, the process was not so smooth, as the members struggled to “Our team name was uninteresting, our car wasn’t that flashy, and we even had to fix it until the last minute. However, our car presented the best performance and eventually became the only car that finished the whole track. This was unexpected, but we’re very happy with how it all turned out,” said the members unanimously. "Small changes and corrections lead to a big difference!" Jeon Chae-yun chaeyun111@hanyang.ac.kr Photos by Choi Min-ju

2017-07 23

[Academics]Vitalization in Detecting NO2 in Daily Life

As environmental pollution is deteriorating, various hazardous gas face people unrecognizably in their daily lives. Professor Kim Hyoun-woo of the Division of Material Science and Engineering is an active researcher in various sensors that could help identify various gas, humidity, or even radiation. His recent paper “Enhancement of gas sensing properties by the functionalization of ZnO-branched SnO2 nanowires with Cr2O3 nanoparticles” proposes another effective method of detecting a particular gas, NO2. Kim expaining the nanostructure of his paper. His research aimed for an effective NO2 detecting nanostructure, which is a structure made from molecules. NO2, also called as nitrogen dioxide, is required to be detected since it can be found relatively easily through the atmosphere even when it is a toxic, air-contaminant gas. Kim mentioned “Once a practical method through this nanostructure is constructed, I wish people can be easily detect this toxic gas.” This nanostructure is composed of three different substances. First of all, a SnO2 (tin oxide) nanowire is required. A nanowire is a nanostructure of an extreme, fine line which has a diameter of one nanometer (10−9 meters). Next, ZnO (zinc oxide) nanowires are branched on the SnO2 nanowire. Then the last substance, which are Cr2O3 (chromium oxide) nanoparticles, would grow on the ZnO nanowires. With a completed nanostructure, detecting NO2 become possible. An illustration of Cr2O3 -functionalized ZnO branched SnO2 nanowires. (photo courtesy of Kim) This nanostructure mentioned in his paper is highly sensitive, which makes it a significant structure. A current always flows within a structure, and a resistance is made whenever there is a current. However, the resistance differs when there is an inflow of another gas. The external gas takes away the electron in the structure, therefore heightening the resistance of the structure. The sensitivity is determined through resistance within the sensor. When the sensitivity is elevated, a structure can perceive more NO2 than the one with low sensitivity even when there’s a same amount in the air. The nanostructure mentioned in the paper is indeed a unique technology. However, Kim also mentioned the insufficiency of this nanostructure. In order to detect NO2, this gas needs to be heated in an extremely high temperature; in the case of the paper, 300’C. Therefore, there is a difficulty for people to sense the gas in the current stance. Kim mentioned that he wants to improve this difficulty through further research. He is currently working on methods that could allow this nanostructure to detect NO2 in a room temperature. Kim wishes to develop a practical nanostructure. Kim is an enthusiastic researcher. He constantly works on structures that could benefit people in their daily lives. He is striving for extreme-high sensitivity in his structures so that people could quickly recognize and react to the contamination. Kim mentioned “I want to make a structure that can be commercialized. A lot of the inventions disappear due to the lack of cost competency or efficiency. I wish to contribute to the promotion of mankind welfare.” On Jung-yun jessica0818@hanyang.ac.kr Photos by Kim Youn-soo

2017-07 18

[Academics]Developing and Improving MRI Contrast Agent

Contrast agents are the substances injected inside or outside of the digestive tract or blood vessels in order to show tissue or blood vessels more clearly during radio graphic examinations such as magnetic resonance imaging (MRI) and computerized tomography (CT) imaging. Its role is crucial as it improves the diagnostic value by artificially increasing the X-ray absorption of each tissue, which makes it more easy to distinguish the biomechanical structure or the lesion from the surroundings. Professor Lee Dong-yun (Department of Biotechnology), through his paper “MRI-sensitive contrast agent with anticoagulant activity for surface camouflage of transplanted pancreatic islets,” has presented an inventive contrast agent that kills two birds with one stone. “When I was conducting this research regarding treatment of diabetes, my biggest concern was whether the outcome would be useful in the medical field or not. Even if the research is flawless, it is of no use if it cannot be put into real uses.” A contrast agent could evoke two main issues: the issue of MRI detection and of blood coagulation. Lee’s research, however, has overcome the two problems. In hopes of creating medical technologies that are valuable and pragmatic, specifically concerning contrast agents in this research, Lee has gone through detailed research and experiments. “The cell therapy products can be said to be ‘coated’ with contrast agents.” The contrast agent Lee has formulated approaches the body in a different manner. Instead of directly injecting the contrast agent into the patient’s body, Lee attached them on the cell therapy products through chemical reaction and then instill the contrast-agent-dissolved cell therapy products into the body. This not only makes detection of cells through MRI or CT imaging possible but also enables controlling of blood coagulation and prevent fibering clot. In Lee’s research, which specifically deals with patients of diabetes, a technology to transplant insulin-secreting cell has been devised for the sufferer. As shown in the diagram, islets (clusters of cells) are implanted into the blood vessels of the liver through catheter, which leads to the problem of accumulation of blood platelets on the surface of the newly implanted cells. This would eventually result in blood coagulation, creating thick fibering clots, further resulting in destruction of the cells. This means the cell therapy products lose their original function and go into nullity. However, with Lee’s research, as the contrast agents are acting as a layer to prevent accumulation of blood platelets and prevent blood coagulation and allow MRI detection at the same time, the use of the newly developed contrast agent is expected to be put in various uses. ' Lee's contrast agents allow MRI detection and prevent blood coagulation. (Photo courtesy of Lee) Jeon Chae-yun chaeyun111@hanyang.ac.kr Photos by Choi Min-ju

2017-07 16

[Event]International Invitation from Hanyang University- HISS

A month long, annually held exchange student program HISS (Hanyang International Summer School) welcomed the foreign students from all over the world on July 1st. HISS has met its 20th anniversary with nearly 2,000 international students in the program, which initially began in 1997 with 20 students. Standing out in all South Korean universities with the highest number of foreign participants, HISS of 2017 has drew up its curtain. The first culture experience program of Week 1 at HISS has been successfully ended. (Photo courtesy of the OIA) Catching two birds with one stone HISS has two goals to achieve for the provided month- academics and Korean cultural programs. Within only four weeks, it may seem hard to provide both educational and cultural programs to 2,000 foreign students. However, OIA (Office of International Affairs) of Hanyang University (HYU) has efficiently divided the academic workload and cultural experience program through subtle time management. “OIA has frequently established more lectures during the HISS which count up to 120 now. Also, enhancing the quality of the classes provided by HYU is another primary mission of ours,” said Angie Lee of the OIA. It included about 120 lectures on engineering, literature, international studies, and more. Weekly cultural programs for the exchange students are also planned by the OIA. On week 1, foreign students who were interested in Korean music, especially K-Pop, had a visit to the SM Town, which is a musical tourist site sponsored by SM Entertainment. On the second week, a friendship party was held on a cruise floating from Yeouido to Jamsil Han River Parks. Later on, OIA planned to escort the foreign students to an amusement park called Everland and a waterpark Carribbean Bay. Their last activity will be held at the Boryeong Mud Festival. Exchange students are enjoying their second activity of the HISS on the cruise. Students are smiling after experiencing various programs provided at the Cruise Party. The highlight of all activities was the cruise party, which News H accompanied with. The party took about two hours where students could enjoy the band performance, special foods, and the beautiful night view of the Han River. “This is my first time staying in Korea, and in Asia. I am enjoying the active atmosphere of Koreans and their unique culture. I’m also looking forward to the HISS programs every weekend,” said Elias El Araj from Netherlands. Also, Mika Auyezkhan from Kazakhstan showed her love for the Korean culture- “I was always interested in Korean culture and I am glad that I chose Hanyang University because it let me experience a lot in South Korea. I also love how they have solid educational structure.” Mountain to surmount Behind the delightful programs of the HISS, there are three OIA staffs and other volunteers who support the whole program. “As the number of participants is increasing every year, it becomes harder for us to manage all students’ circumstances like health. We already had a few visits to hospital with our students,” laughed Rick Punt of OIA. However, despite the augmenting size of the HISS program, OIA and HYU volunteers are paying careful attention to the students to prevent any accidents. “We are still proud that Lee, Punt, and I are leading the HISS, even though our July in calendar disappears completely,” said Min-joo Park of the OIA. “Without love for the HISS, I don’t think the program can be so successful. As we recap all students’ overall thoughts and reviews, we will constantly strive for the better HISS every year,” added Lee. Friendship between Korean volunteers of HYU and foreign students from the globe has become stronger through various activities. Aside from the internal difficulties, external factors such as international circumstances and the state of affairs also impact the HISS. “This year, students from the United States dwindled due to the recent North Korean crisis. However, number of Singaporean and Kazakh students augmented due to the increasing interests in the Korean culture,” said Punt. HISS, where unforeseeable and urgent situations sometimes take place, still remains as one of the best exchange program in South Korea due to the efforts people at the backstage put in. Kim Ju-hyun kimster9421@hanyang.ac.kr Photos by Choi Min-ju

2017-07 09

[Academics]Speech Privacy in High-Speed Train Cabins

Professor Jeon Jin-yong of the Department of Architectural Engineering is an expert in the field of architectural acoustics. His paper, “Control of interior surface materials for speech privacy in high-speed train cabins,” discusses a novel method of using the sound masking technique along with the interior sound dynamics inside the train itself. At times, Speech Transmission Index (STI) is required in Europe and North America for announcements made in trains. During the period of 2012-15, with the support of Korea Agency for Infrastructure Technology Advancement (KAIA), Jeon had the opportunity to create architectural sound design for trains. Jeon is explaining about the importance of speech privacy. Jeon has experienced a serious problem about five years ago while riding a KTX train and had a chance to hear the ladies talking at the back about seven rows away from him. All the speeches being made by the ladies were being bounced on the shelves of the KTX and reached the other passengers which meant that everyone was listening to their conversation. After the experience, Jeon has decided to set up a new guideline on high speed trains for speech privacy between people. There are also surveys that point out that the most annoying noise on KTX users being the conversation between people by 31.8%. It is suggested by Jeon that the back of the chairs should be high and there should be the minimum space between the chairs in order to block out the conversation from being overheard. Since sound travels through the air and bounces from walls to ceilings, less space being provided for it to move around freely is a way to retain speech privacy. In addition, the material for chairs, ceilings, and side walls being high sound absorption material is suggested to reduce the interior noise. There is yet to be studies made on its fire resistance performance evaluation, weight lightening, and maintenance. Using sound tracking devices, Jeon was able to redesign the interior of the KTX. (Photo courtesy of Jeon) Sound masking has been one of the solutions as to provide speech privacy. It is the beating, squeaking and rattling noises that are created outside the train being intentionally flow into the train to cover up the conversation between people at about 50 to 60 dB. Speed trains with no interior noise has the features that allows the sound of human voice to travel through the space such as low ceiling, long space, and narrow walls. However, sound masking does not suggest interior noise to be too high since it would make the passengers dissatisfied. It means that there has to be enough interior noise in order to secure the speech privacy. Through Jeon’s studies made with computer programs and 1:10 scale sized KTX models, it is now suggested that high speed trains being produced nowadays provide enough speech privacy. After having contributed to the society through his novel findings, Jeon wishes to continue with the studies even further to solve the problem of noise complaint issues between neighbors through deep learning programs. Jeon wishes to contribute to the society through his sound interior designs. Kim Seung-jun nzdave94@hanyang.ac.kr Photos by Kim Youn-soo