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2016-12 05

[Academics]Earthquake Spectra and Sound Structures

Professor Han Sang-whan of Department of Architectural Engineering is an expert in the field of earthquake and structural engineering. “More recently from the earthquake that hit Gyeongju on September 12th this year, there is an increasing awareness regarding the safety of buildings,” said Han. Thus, he has been researching on improving the standards of buildings before and after it is constructed. His recent papers, “Effect of connection rotation capacities on seismic performance of IMF systems” and “Building Height Limits for Steel Intermediate Moment Frames” specifically shed light on enduring an earthquake's seismic power. Accurate prediction of seismic loading and production There are three different steps to the research when it comes to evaluating a building’s performance regarding its safety. “First, it is essential to predict and calculate accurate magnitude of an earthquake force when one is trying to build a building at a specific place,” said Han. The research used the program that predicts possible earthquake activities and its effect on other different regions within Korea. It is able to do so as the program considers all the past earthquakes which occurred in Korea, all differing in location and magnitude. With this program model that shows the scale of magnitude that affects farther locations, it is able to anticipate other possible earthquakes and their effects. An example of a simulated ground motion due to the Gyeongju earthquake. (Photo courtesy of Han) Developing an analysis model to evaluate the safety of a building The next step is also critical, which is to establish a precise analysis model to evaluate a seismic performance of a building. It is important to know whether a structure is capable of enduring the effect of earthquake. “It can be done by an experiment in a lab, but it is hard to do so with large buildings due to its size and financial issues. As an alternative, an analysis model can be used as an alternative to evaluate instead through a computer program,” said Han. It is crucial for the analysis model to be on the point to exactly evaluate other buildings’ performances. “One of the top priorities of a building when an earthquake hits, is to prevent loss of human lives. Thus, the analysis accurately predict responses of buildings structure subjected to not only small earthquake ground motion but also large earthquake ground motion causing the buildings to collapse,” said Han. Such analysis model is based on the conventional mechanics theory. But the theory itself cannot solely explain the rotation capacities of various factors inside a building due to the complexity of the components and their connections of building. It is therefore necessary to conduct experimental tests for the component of building structures to develop and improve analysis models for every parts of the building. Experiments of different parts of components are also combined to make analysis models more accurate. (Photo courtesy of Han) Last but not least, by using the developed analysis model and seismic force, it is able to evaluate the safety of a building towards an earthquake. The method of evaluating the seismic performance of a building has been developed, which can accurately assess the safety of the building both before and after it is constructed. Within the flow of Han’s research, the paper specifically contains an experiment on this level, which is evaluating the seismic performance of IMF (Intermediate Moment Frames) with connections having a rotation capacity of 0.02 radian. To put it easily, as mentioned above, it refers to the moment connections of a building and 0.02 radian is a designated minimum rotation capacity of moment connections that was defined by US seismic design standard AISC 341-10(a model standard of Korean seismic design). Through the research and experiments went on, it was observed that the rotation capacity of 0.02 radian could not successfully guarantee the satisfactory seismic performance of IMFs. Thus, the paper suggested the number of rotation capacity to improve the safety standard. The following research that Han and his co-researchers are committed to is quite promising, as it is currently being introduced to the architectural standards of the US. “We hope our research could later motivate domestic buildings to meet safer standards,” concluded Han. "I hope my research could contribute to the making of a safer world against earthquakes." Yun Ji-hyun uni27@hanyang.ac.kr Photo by Choi Min-ju

2016-12 04

[Event]'Butterfly, Spring, Dream', a Play

“One day, a butterfly comes to you. It invites you to a fantasy world where the ice prince lives. One long, long night in midwinter, a journey full of fantasy comes to you like a dream…” (Excerpt from the play, 'Butterfly, Spring, Dream') Students from the Department of Theater and Film brought their creativity into action by showcasing a live musical play called 'Butterfly, Spring, Dream'. The event was held for four days from December 1st to the 4th at the Blackbox Theater of Hanyang University's Olympic Gymnasium in Seoul. The play was a unique one, having both international and Korean students as main actors and generating dynamic acts through dances and live band music. A girl in a dream Above is a brochure of the play. Briefly, the play is a fantasy journey that begins when one girl, who wants to escape, is drawn into an unknown world by a butterfly. In depth, the plot revolves around two worlds, a cruel reality contrasted by a fantasy world depicted by a dream. The protagonist, Lam Tsz Yan (Department of Theater and Film, 2nd year), acts as herself in the play, and she experiences extreme stress after failing to adapt to the foreign place where she studies. Later, a butterfly, acted by Wang Mei Yi (Department of Theater and Film, Graduate School), guides Lam through stages of dreams to help her find courage in reality. The story was inspired by both Korean and Chinese mythologies, creating a mysterious oriental fantasy overall. The producer of the play, Shin Min-kyung (Department of Theater and Film, 4th year) described the production process of 'Butterfly, Spring, Dream'. “The reason why we chose to do a play with music is because we thought it was more important to focus on the visualization and sensuality instead of the actual language and dialogues.” To overcome the language limitations of international students, the play portrayed the message through creative dancing and detailed stage-setting. The ingenious feature of the play was the live band and percussionists seated behind the stage, playing music throughout the scenes. The music and choreography were all created by the students from scratch. Therefore, it formulated a musical-like atmosphere, pulling the audience into the fairytale, or more precisely, the 'butterfly tale'. Global workshop “Students who were involved in the play are all part of the ongoing program called the Global Workshop, which was created for international students,” said Hong Sang-hyeon, the stage manager and actor. “Therefore, we can say that the play is part of the Global Workshop.” Due to an increased number of international students through international exchange programs, the Department of Theater and Film actively participated in cultural exchange through a collaboration of plays. A total of 20 students from China, New Caledonia, Guatemala and many more, worked with the Korean students in the play. Shin, the director, said, “This specific play aimed to depict identity issues caused by growing globalization. I think the audience can easily relate to the story because the message sheds light on those who are under pressure in any form of new environment, not just in an international setting.” The play generated an exotic atmosphere for the audience. (Photo courtesy of the Dept. of Theater and Film) The cast were composed of both Korean and international students. (Photo courtesy of the Dept. of Theater and Film) In the early stage of production, there were some concerns regarding communication due to the difference in cultures among the international group of students. However, this concern only remained a small worry as the actors coped with the communication problems through numerous practices together for perfect harmony. Lam, from China, said, “For me, it was the first time to act on a stage and I had lots of pressure to do well. I was quite like the character I played in the play. Thankfully, other Korean students, who had more experience, helped me by teaching me all about the theater arts from the basics. I had lots of fun!” The male protagonist, Kim Lok-yon (Department of Theater and Film, 4th year) also recalled the time he spent preparing for the play. “It was a new experience for me as I worked with the international students,” said Kim. “When they asked for help, I only advised them to act naturally. As a student, I am in no position to teach someone else. I taught them the correct pronunciation of Korean words actively.” (From the left, respectively) Wang, Lam, Kim, and Hong have all participated in the play as actors. International unity 'Butterfly, Spring, Dream' attracted many international audiences, resulting in a complete sellout for all four days. Even though the play was mostly in Korean, there were Chinese subtitles provided on the side of the stage to assist the Chinese audience. The ongoing success of the plays by the Department of Theater and Film indicates the high quality of the performances. More importantly, the global mentality of the students generate more than just success as students learn to cooperate with people from different cultures to share a message on international unity. “Here it comes. The fated moment. Finally, after the long, long wait of three thousand years, when the permanent snow that nobody thought would melt… If a flower blooms, the ice will melt and you will fulfill your hope.” (Excerpt from the play, 'Butterfly, Spring, Dream') Park Min-young manutdmin@hanyang.ac.kr Photos by Choi Min-ju

2016-11 29

[Notice]Department of Theater and Film in Collaboration With Korean and International Students

Hanyang University’s Theater and Film Department is putting on a creative musical which is a collaboration between international students from various countries and Korean students. From December 1st, continuing for 4 days, they will perform the musical <Butterfly Dream: 나비, 봄, 꿈-호접춘몽(蝴蝶春夢)> at the Black box Theater at Hanyang University Olympic Gymnasium in Seongdong-gu, Seoul. The theatrical performance is about a fantastic journey that is based on Chinese myths and legends. This story begins with a girl, who often dreams of escaping reality, being pulled into a curious world along with butterflies. The cast consists of around 20 people from countries including Korea, China, New Caledonia and Guatemala. In addition, choreography based on Chinese traditional dancing, setting and lighting to create the world of fantasy, and a video using chromakey shooting techniques makes this performance to life. Professor Kwon Yong, dean of Department of Theater and Film, said “This performance is the result of a new creation of the Department of Theater and Film, a special curriculum called ‘Global Workshop’, which collaborates international students with Korean students.” He added, “Based on this performance, we will continue to put more effort on globalization of culture and arts.” For more information, call 02-2220-0789. ▲ poster ▲leaflet (front) ▲leaflet (back)

2016-11 29

[General]Hanyang University releases photos of entrance exam scenes in the past

Hanyang University releases photos of entrance exam scenes in the past commemorating 2017 national college entrance exam. ▲Examinees taking entrance examination on February 19, 1969 ▲Examinees taking entrance examination o on February 19, 1969 ▲Students preparing warm tea for test-takers at the campus on February 13, 1976 ▲Examinees taking entrance examination at the nursing room on February 2, 1977. ▲Examinees waiting for the announcement of successful candidates in Banwol campus(current ERICA campus) in Ansan city, Gyeonggi province on January 17, 1979. ▲Examinees taking fine arts performance test at Seoul Campus on February 2, 1977. ▲ Examinees taking fine P.E performance test at Seoul Campus on the 14th of January, 1983. ▲ Examinees interviewing and taking practical tests on Seoul Campus, January 14, 1983. ▲Examinees taking entrance examination on January 12, 1986. ▲Examinees taking fine arts performance test at Seoul Campus on January 12, 1986. ▲Examinees submitting the application document in Seoul campus on December 22, 1997.

2016-11 28 Important News

[Academics]Unified Model of a Minute World

Professor Cho Jun-hyeong of Department of Physics is interested in the study of low-dimension nanomaterial of one and two dimensional nanostructures formed on the surface of solid matters. Working as an editorial staff of Scientific Reports, a sister magazine of Nature, Cho is the member of the Korean Physical Society, American Physical Society, and the Korean Vaccum Society. Cho's paper, completed with a second editor, Lee Se-ho (Physics, Doctoral program), 'Dimensionality and Valency Dependent Quantum Growth of Metallic Nanostructures: A Unified Perspective', suggests a unitary, simple model that explains the preferred length and thickness of nanowires and nanofilms made by various kinds of metals, by using diameter of the nanostructure and the phenomenon called Friedel Oscillations. Cho embodies himself in the field of nanostructures. (Photo courtesy of Cho) The atoms of a solid mass are arranged in a periodical manner. However, there is a phenomenon which breaks this periodicity, called crystallographic defect. For example, if an atom is not present where it should be situated, it is called point defect. In addition, planar defect occurs when many atoms do not exist in a surface form. Nanowires that are covered in Cho’s paper have point defect from a certain place of their infinite length. On the other hand, nanofilms have planar defect from some amount of their infinite width. When defects of a solid mass occur, the electrons of solid matter and the defects interact together, forming a density wave named Friedel Oscillations. Friedel Oscillations are a similar to water waves made when a rock is thrown on the surface of a calm lake. In the study, Cho discovered that nanowires are energetically stable at the length that matches the wavelength of Friedel Oscillations. The period of Friedel Oscillations is determined by the composition and diameter of the nanostructure. Cho found that the preferred length of the nanowire and thickness of nanofilm, called magic length and magic thickness, differentiates depending on the diameter of the nanowire and its metal component. Cho found out that as the diameter of nanowire extended, the period where magic length occurs differs in length in accordance with the type of metal. The period of alkali metals and group IB metals (copper, silver, gold) increased as the diameter of nanowire elongated. In the case of transition metals and groups IIIA to VA metals, the period decreased. The structure of nanomaterials (left) and the magic length of nanowires composed of diverse metals (right). (Photo courtesy of Cho) Cho confirmed the structural stability of nanowires by changing their diameters. When the diameter of a nanowire is more than 10Å [Å: angstrom, unit of length equal to 6990100000000000000♠10−10 m], it can be called a nanoisland. If the diameter of the nanowire becomes infinitely large, it will become a nanofilm. “In this study, we found that when the diameter of the nanowire is increased, the vibration period becomes the same as that of the nanofilm, also being saturated,” Cho said. This means that when the diameter of the nanowire becomes larger, the magic length equals the magic thickness of the nanofilm. The reason for this saturation of the oscillation period is because the Friedel Oscillations are the same in the case of the above two systems. There was a need for a comprehensive theory that encompasses studies on nanowires and nanofilms that have been ensuing for the past 30 years, because there was a lack of unified understanding about different magic lengths, and the thickness of nanowires and nanofilms from diverse substances. “I believe that finding new puzzle pieces has a lot of meaning but putting those piled pieces together into a big picture is also very significant,” Cho emphasized. “This research may spur motivation for other research on new nanostructures, since it explained a preferred length and thickness in a uniform approach when low-dimensional nanostructures are formed,” he added. Currently, Cho is handling a joint study with University of Science and Technology of China (USTC) and Zhengzhou University's research teams, as well as continuing theoretical research on different nanostructures. The research plan of Cho’s laboratory is to proceed with a study which combines surface, nano, and topology fields. Not only has Cho achieved great accomplishments in the field of nanostructures, but he is concerned about his students who would lead the scientific domain in the future. “I am trying to offer students a lot of experiences, such as encouraging them to attend academic conferences. I also try to converse with them, because science can advance in that way- through involvement and communication,” he said. Cho thinks what professors, schools, and the government should aim to create suitable atmospheric and foundational provisions for science students for them to focus on their work. Jang Soo-hyun luxkari@hanyang.ac.kr

2016-11 28

[Culture]Global Community in Itaewon, Seoul

Itaewon refers to the roughly 1.4 km-stretch from Itaewon 1-dong to Hannam 2-dong in Yongsan-gu, Seoul. When you get off at Itaewon station, line number 6, signs of stores written in English, Chinese, and Japanese will catch your eyes. Just by walking along the streets, one will soon sense the exotic atmosphere that can only be felt in Itaewon. In fact, Itaewon is one of the most outlandish places in Seoul where people of different nationalities and cultures are clustered. As a 'foreign city', Itaewon is also the place where foreign residential districts and a number of foreign embassies are gathered. In 1997, Seoul designated Itaewon as the first ‘Special Tourism District’ for both foreigners and Korean citizens. There are more than 2000 stores that include shopping centers, restaurants, recreational facilities, trade firms, hotels and tourist bureaus. Hamilton Hotel is located at the center of Itaewon. (Photo courtesy of Hamilton Hotel Seoul) Stories behind its formation While the word 'Itaewon' originated from the Joseon Dynasty when it originally referred to a residence specifically for the Japanese, the current form of this global tourism site is more relevant to Korea’s modern history. After the Korean War (1950-1953), the American military base was established in Yongsan which was later followed by more residential zones and businesses for its soldiers. Itaewon was once called as the 'Las Vegas of Seoul', the recreation center for American soldiers. Soon, the place attracted more foreigners who started to spread their own cultures in the region. Only in Itaewon Itaewon Antique Furniture Street is close to Itaewon station Exit 4. (Photo courtesy of Visit Seoul) As mentioned, there are many different stores and restaurants that fascinate tourists. While there are high-end brand stores in Itaewon, big and small indie shops in street corners contribute more to the distinctive character of Itaewon. Fashion shops specialize in imported clothes, furs, handbags, shoes and antique furnitures that are hard to find in general Korean markets. Its price range is quite extensive- from being fairly affordable to being as expensive as designer brands. Dress shops are also more easily seen in Itaewon for foreigners who are more used to partying than Koreans. For foreigners with different body shapes, bigger sizes are also well-stocked in Itaewon shops. Cuisines from 30 different countries such as Korea, the US, the UK and India are also one main reason why people visit Itaewon. The 'World Food Street' located at the back of Hamilton Hotel is currently one of the most popular places to eat as it allows people to try exotic foods that are hard to experience without going overseas. Itaewon is the only place where people can find cuisines that are hard to find in other parts of Korea. It is said that Bulgarian and Uzbekistan restaurants can only be found in Itaewon. Moreover, the fact that a lot of foreign restaurants stick to their traditional or original recipes adds to their allure. The World Food Street of Itaewon. (Photo courtesy of Visit Seoul) The first Islamic mosque in Korea Behind the Itaewon fire station, another unfamiliar sight can be spotted along with the smell of pungent spices. It is Usadan-gil, or Islamic street, which manifests the harmonious blend of Seoul’s old landscape and Islamic culture. The first Islamic mosque in Korea, the Seoul Central Mosque, is located at the center of Usadan-gil. In the country where Christian crosses are more frequently found, twin minarets that tower around the mosque is a sure unique site to check out. To visit the mosque, people must abide by the Islamic law, which forbids wearing short-sleeved tops, skirts, and pants. To take a more constructive tour inside the mosque along with a guide, it is advised to make a reservation beforehand through the Seoul Central Mosque's official homepage. With 35 thousand Korean Muslims, there are a total of apporoximately 150 thousand Muslim devotees who attend the Itaewon Muslim Mosque. (Photo courtesy of Seoul City Tour) Itaewon is a place where different people from various cultures coexist. It is an important duty for all of its members, both Koreans and foreigners, to try their best to keep peace and security within its community while fostering its uniqueness in Korea's number one tourism district. Yun Ji-hyun uni27@hanyang.ac.kr

2016-11 28 Important News

[Event]Hanyang Startup Open Campus

On November 23rd, Hanyang Startup Open Campus was held in the Alumni Building of Hanyang University's Seoul Campus. During this event, alumni entrepreneurs and students interested in starting their own businesses were invited. A variety of sessions were held regarding business startups. The program consisted of the following sessions: Open Class, Recruiting, Exhibition, Mentoring, and Summit. The 8th Hanyang Startup Academy (HSA) took charge of the ending ceremony along with other programs of the event. During the Open Class session, special lectures were given by the CEO of Zennycloset, an eco-friendly brand, along with the manager of Wadiz, a crowdfunding group. Through the lecture, people shared their experiences of succeeding in business. In the second session, a job recruitment fair was set up to connect students to the Hanyang Startup companies. The Exhibition session was one of the most bustling events of the whole event. Since goods and major work have been on display in the lobby, people were able to touch and experience the products created by Hanyang startup companies. One of the most popular goods was the 2016 Art & 3D Printing Design Award winners' work, which consisted of daily supplies, industrial supplies, and reusable design goods. The Exhibition session was one of the most bustling events of the whole program. As for the Mentoring session, experts with practical business skills acquired through their own hands-on experience consulted with those wishing to start a business. Some of the common issues that arise from startup businesses were dealt with. The session consisted of the following topics: business, accounting, law, patent, tax, finance, public relations, marketing, and overseas expansion. With experts participating from such diverse fields of expertise, people were satisfied with one-point lessons that answered a lot of the questions they had in mind. The main session of the day was the Summit, which included the completion ceremony of HSA, and the bestowal of the 2016 Art & 3D Printing Design Award. This year, it was the 8th completion ceremony of the HSA, where a total of 98 trainees (26 in advanced course, 72 in standard course) had applied. The ratio of enrolling bachelor students to graduates was 3:7. They were from majors as varied as to include Science and Engineering, Business, Art, Music and Physical Education. As for the Design Award, the grand prize went to Park Ju-young (Department of Chemical Engineering, 2nd year) who produced a non-electricity sound amplifying speaker. Park Ju-young won the grand prize for the 2016 Art & 3D Printing Design Award. The Hanyang Startup Open Campus was a meaningful event in that it summed up this year's excellent startup results acquired by the alumni and their subsequent companies. The program contained numerous sessions that were useful to the attendees, and would have been a great choice for budding Hanyangian entrepreneurs to have participated in it. Kim Seung-jun nzdave94@hanyang.ac.kr Photos by Choi Min-ju

2016-11 27 Important News

[Alumni]Yoo Seul-gi's Vocal Music and Career

Yoo Seul-gi of the Department of Vocal Music (’10), whose life has been associated with music since the age of four, embarked on his journey of pursuing his career as a vocal singer when he was in middle school. Recently televised through an audition program called Phantom Singer, Yoo drew public attention with his singing abilities and his record- graduating Hanyang University as valedictorian and being the vocal trainer of the famous singer Yoon Min-soo after graduating. The alumnus is looking forward to making vocal music more popular and approachable, as well as becoming a renowned vocal singer himself. Yoo on Phantom Singer After finishing his military service in 2015, Yoo was considering of going abroad for further studies on vocal singing. However, circumstances were not too favorable for him to do so, despite his avidity and eagerness. An alternative option that provided Yoo with what he wanted was the audition program Phantom Singer, which gave him an opportunity to let the public hear his voice. While on air, he performed the music titled ‘Granada’, through which he gave a message: since this song possesses both smooth and tough sensations, Yoo wanted to demonstrate that he is able to manifest both facets at the same time. “It is hard for a soft person to look strong and vice versa. By performing this music, I wanted to show that I have my own unique feature, a mixture of both aspects,” remarked Yoo. ▲ Yoo performing 'Granada' on Phantom Singer “Among a big group of voices, it is essential for me to sort out my own voice, knowing what my best part is,” explained Yoo. In this context, Yoo regards himself as his own rival, distinguishing his voice from the others’. Winning to the final round of the audition, Yoo is determined to make each stage memorable and impressive to the audience, not focusing too much on the outcome. When Yoo was a freshman, he did not think he had a talent for singing. However, on his very first vocal test, he was evaluated as the best student among his peers. It was from that moment that Yoo pushed himself to work harder and do his best, which he did by practicing until late at night every day throughout the six years of his university life. “It is undeniable that people with innate abilities have different starting points and more advantages. Yet I strongly believe that if one has the passion that supports that confidence, they can acquire such a talent,” said Yoo. "While I was at university, I was taught by Professor Kho Sung-hyun, one of the most eminent baritone singers of Korea. I could say that there are traces of his teachings in my singing,” he added. Coaching the famous singer Yoon Min-soo on vocalization is also Yoo's notable task. He became the vocal trainer of Yoon through an acquaint composer who offered Yoo the place. Yoon had never received vocal training before but he insisted on getting lessons from a vocal musician, since vocal music centers on vocalization when producing sounds, signifying considerable help to a singer. “I want to make vocal music more friendly to the public. Compared to popular music, vocal music may feel distant from people, being somewhat unfamiliar to them. Through television programs like Phantom Singer, I hope vocal music draws more attention and becomes more receptive,” noted Yoo. Yoo Seul-gi, the alumnus of 2010, Department of Vocal Music (Photo courtesy of Yoo Seul-gi) Jeon Chae-yun chaeyun111@hanyang.ac.kr

2016-11 25
2016-11 20 Important News

[Academics]Institutionalization of the green certification scheme

Professor Kim Hong-bae of the Department of Urban Planning & Engineering is an expert in the field of urban planning. His paper, “A cost-benefit analysis for the institutionalization of the green certification scheme”, discusses about what would be beneficial when it comes to achieving the green certification. Green certification is the standardized certificate used to prove the suitability of Green technology and products. As for other developed countries, there has been green certifications since the 1990s following the concerns of environmental pollution. For instance, Great Britain has the BREEAM, Japan has CASBEE and United States has the LEED. These institutionalized green certificates are competing to become the world standard. Although Korea now has GBCC, it is not institutionally stabilized compared to other countries yet. Other countries provide the green certification in terms of community, rather than single building itself while Korea is on its way to broadening its spectrum towards giving communities the green certification. ▲ Kim explains about the green certification What is so special about Kim’s paper was that it has provided a deep insight into whether green certification was something that really provides people with benefits in life or not. Through the cost benefit analysis, he has provided the guidelines to how the system would be generally constructed. By providing low carbonizing 45 sectors ranging from industry to policies, Kim has divided the qualification standard and it has its meanings in that social costs and benefits are derived. Most of the standards are very straightforward. However, there are some of the ambiguous points to be digitized into measurements which include pride or self-esteem. Most of the measurements are easier to make for instance, the market value of the house that individuals live in. However, it is hard to show the pride in terms of numerical values to be seen. This is where the contingent valuation method (CVM) comes into action. This explains the “willingness to pay” and digitizes the inherent value inside individuals. ▲ Kim expresses that energy should be saved Some of the studies that Kim is engaged in currently is related to energy harvesting. By recycling the energy wasted into creating a new source of energy, it has its huge meanings. Also, Kim has pointed out a special point in that electric cars do not actually lower the carbon dioxide level nationally. “Although in regions where electric cars operate will show lower signs of carbon dioxide level, the regions where electricity is produced will show greater levels of carbon dioxide which means that nationally, it breaks even,” said Kim. The goal of Kim’s studies leads to one simple logic. In order to achieve low carbon, low energy comes first. The responsibility to saving energy would lead to a lower level of carbon dioxide, which is believed to be one of the worst factors that affect global warming. People need to actively engage in actions such as car sharing or even the smallest actions such as saving water, electricity and the environment as a whole. Kim Seung-jun nzdave94@hanyang.ac.kr