Polymer Journal #4

Screen Shot 2016-05-09 at 7.33.27 PM

For creating a new polymer, we had a topic to start with. ‘Reduce a sound’. We had some difficulties to set up a goal with details, which comes under the step called ‘Define’. Firstly, we planed to reduce the sound that comes from outside the room by blocking the spaces between a wall and a door. But during ‘Develop solutions’ step, we suddenly figured out that it was not a good, possible goal for us. We thought over to find an annoying sound around us. Than we came up with a new goal, to reduce the tapping sound that comes from heels.

We also met some problems during creating and testing our prototypes they do fit the goal. At first, we found a base polymer that almost perfect for reducing sounds, which was gloop and boogers. By mixing the recipes and adding more materials, testing if it`s working properly or not (‘Optimize’). Of course we met some failures and made some mistakes, but we compared and optimized the product to find the reason of the failure and solved them all.

Our first prototype that has failed was made of 7ml of water, 15ml of borax and 15g of glue by applying the recipe of gloop, but it was unable to stick on heels and was not easily molded. So we tried to increase the stickiness by decreasing the amout of borax and water. But the second prototype also failed because it was not moldable. Therefore we got an advice and ideas from other group, and tried to fixe the whole problem we had. Adding boogers, super slime, guar gum and more glue for stickiness, the result was ‘successful’.

20160428_150117 <- first prototype

20160428_145720<- final product


After meeting two failures and solving the problems of them by discussing with each other, we eventually could create the final version of our polymer. As you see, to create and develop our polymer, we had to go through the cycle, ‘Define’, ‘Develop solutions’, and ‘Optimize’. We learned how to collaborate with people in the group and finding the reason of failures and fix them through the cycle. Engineering can seem to be hard and difficult, but actually it isn`t. The process of engineering even helped me learn how to communicate and share ideas with group members. Engineering not only makes the world more comfortable, but also give us a lot of lessons through doing it.

What Had They Done to Korea


During the Japanese Occupation Period, Koreans were oppressed by the Japanese Government in various ways. And the book called ‘When My Name Was Keoko’ by Linda Sue Park shows some of the oppressions by Japanese. There were of course harsh tortures toward Koreans, which caused millions of people died and sacrificed, but the one of the ways I want to explain is that they used to trample Korea`s spirit, national pride, and sense of belonging was to force Koreans to forget their own language and use Japanese for everything. They also made All Koreans to have a Japanese name, and at schools, they punished the students who called each other with their Korean names. Even they made a Korean marathoner to run for their country with a  Japanese name. These kind of oppressions were even worse and more painful than physically killing and torturing people. Japanese Government were cruel and merciless, but Koreans got over those sad and painful period by maintaining what the Japanese Government tried to take away from them. It is truly an honor to have these ancestors who were full of patriotism and a strong mental that was not broken by Japanese Government`s tortures.

A Girl Became Active For Her Country

Sun-hee was born when every Korean had used Japanese. She was used to it so she didn`t know what was the problem about it. She was just a little innocent girl who didn`t know or care much about what Japanese were doing to Koreans. However, as the time past, she starts to realize about the reality and starts to be active about the situation.


“The youngest in the family was never supposed to talk when older people were talking. And girls weren`t supposed to talk much anyway, not when men or boys are around.” (Park, 6)


Sun-hee could not easily show her opinion or emotions because she was a ‘little’ ‘girl’. She was never allowed to be in men and adults` conversation. But she always asked her older brother, Tae-yul to tell her about men`s conversation. However, even she was trying to listen to what adults say, she couldn`t get why she should use Japanese and cannot use Korean, but she didn`t really bother using Japanese. She was too young to know or argue about the cruel society. Even when a Korean runner Shon Kee Chung was introduced as a Japan runner with a Japan name, all other members of her family was full of anger, but Sun-hee couldn`t think that it is a serious problem.


“I would like to learn Hangul. Would you teach me?’ (93)

However, after she started learning about the real history of Korea and heard the descriptions for the situation that Koreans were in, she changed her position and started thinking over about her life, relationship between Koreans and Japanese, and what should she do for all of these. She not only became more active to achieve the goal, to get the independence form Japan, but also grown up.

Even They Took Different Actions


1910 – 1945. Korea was under Japanese occupation. The book ‘When My Name Was Keoko’ by Linda Sue Park shows 1940 to 1945. Sun-hee`s Uncle and Abuji (means ‘father’ in Korean) show different actions toward the situation they were in.

In 1940, Japanese Government made a new law. They forced Koreans to get a Japanese name and never use their Korean name. Whenever students called each other with their Korean name, they were both punished. Even Shon Kee Chung, the Korean marathon runner who won the marathon, was introduces as Kitei Son of Japan. Sun-hee was not that serious about it because when she was born, Japan was already ruling over Korea. Furthermore, Koreans were forbidden to use their native language in any point. And Uncle and Abuji show different reactions to this totally unfair situation. “What`s Uncle doing, that Abuji wants him to stop?” – Sun-hee (Park, 39)

“Uncle works for the resistance. For the illegal independence movement. He`s been working with them for a while now. At night, or when no one`s around, he prints a resistance news paper.” – Tae-yul (71)

Uncle was really mad at the news about Shon Kee Chung, and he put his anger into action right after he heard the news. He joined the underground Korean resistance and started to change back Shon Kee Chung`s name and flag to Korean on the newspapers. He knew that it would take him into such a huge trouble, but he didn`t stop. Even though he was badly beaten up by Japanese soldiers and even got some broken ribs, he never stopped rebelling to Japanese Government by showing his opinion by taking actions.

On the other hand, Abuji was not an active person. He didn`t show his opinion with his actions. He was a vice principal who was always just reading books. Because of this kind of passive behaviors of him, Tae-yul thought that Abuji was such a coward, but of course he was not that kind of person. Actually Abuji was keep offering the news for Korea`s independence and spreading them away by using his position. It was just he didn`t show or tell what he was doing against Japanese Government for Korea to his family.

Over all, they both had very different attitudes, but as a result they both had a same purpose and was aiming the same thing. Even they took different actions, they were one who were fighting for one thing.

Polymer Journal #3


A creation needs many failures to reach to success. We also had to undergo trial and error to get the final recipe. We had total 3 prototypes including the failed recipes.

-First Recipe

borax(10ml) + glue(4.3g) + solid cornstarch(5g) + water(15g)

  • Used borax, which is the key material of gloop. It needs to be sticky to stick on a heel, not moldable and not sticky at all.  Not good for the polymer at any point.

-Second Recipe

PVA solution(20ml) + Borax(4ml) + glue(12g) +liquid starch(15ml) + guar gum(1.5g)

  • Got an advice from other group. Super slime + Boogers + Guar Gum. Guar gum makes the polymer rubbery. Had a test on a high heel. It actually reduced the sound. It seems to be suitable for our purpose, but still, its stickiness should be increased to use.
  • Got a feedback – to totally reduce the sounds, the polymer should be able to cover the front heel, not only the sharp back one.

-Final Recipe

PVA solution(20ml) + Borax(4ml) + glue(15g) +liquid starch(15ml) + guar gum(1.5g)

  • Added 3g of glue compare to the second prototype. It was to increase the stickiness of the polymer. It is easy to mold, and it stays in the shape after molding. It is also sticky enough.

Our final prototype is almost perfect. To try more to make the polymer better, we should try a new recipe with containing  less liquid starch to increase stickiness. Exploring new prototypes will never stop and we will keep trying to improve the polymer better and better.

Polymer Journal #2



Our polymer has some required characteristics, and we have to find a polymer to be the base of it. Firstly, oobleck cannot be used because it changes into liquid form easily, and also changes its property when water is added.  Also super slime is too slimy and not moldable. And that means that they are inappropriate to use for our polymer, because it should stay in a certain shape after molding it. Therefore, gloop and boogers, especially gloop will be the best base for our new polymer. Boogers and gloop are quite similar.

Gloop = PVA solution + liquid cornstarch,

Boogers = Glue + Water + Borax

They both have PVA in them, we must use it to make the materials mixed and sticked together. Borax is the key material that is  need to increase bounce and make the polymer less stretchy.

We should test each prototypes by using heels, cover the bottom with the polymer and compare how much of the sounds reduced and choose the most effective one to receive our goal.

Polymer Journal #1



Whenever you walk in high heels in library, tapping noise will be produced from each step you take. Then every times you walk, everyone will glare at you because you are interrupting him or her by making noise. Our new polymer has a goal to reduce that noises from high heels and prevent this kind of situations. We targeted female adults who wear high heels as our main costumers. We cannot easily find a product that can cover up every different type of heels easily and simply. The polymer will be sticked under your heels to prevent making tapping noise while you are walking. Therefore there are some characteristics required for it. Firstly, it must be moldable to be able to fit every different type of heels, and should stays in shape after molding. Also for rainy weathers, it should not be melted in water, be waterproof.

By using this polymer, you can walk in high heels more comfortably without worrying about noises.

‘Hope’ Always Supports Me



‘Hope is the Thing with Feathers’ by Emily Dickinson is a poem about ‘Hope’. In the poem, it uses ‘a little bird’ as the  metaphor to describe what does hope mean for her.

The little bird in the poem never stops singing for ‘me’, don`t matter whatever happens. Also it never asks ‘me’ for anything. It just always stays there for ‘me’. This metaphor that the author used shows that the author believes that hope is a strong support of herself that never disappears. Hope will always be in your mind and supports you.



> Used program

MediBang Paint Pro



Is the Quadratic Equations Just for Studying?


Have you heard of quadratic equations? You might think it`s just one of the things that we learn from math classes, and don`t use in real life. But in fact, we can easily see quadratic equations in real world. Everything that draws a parabola is forming a quadratic equation. Also throwing balls and jumping down a stair make quadratics equations. Do you still believe that this kind of math is useless in your life? Math is all around us. We need math everyday and it is anywhere, anytime. Do not only think math as study.

Ax^2 + Bx +C = y   <- This is the standard form of quadratic equations. A decide how wide the parabola will be, and B is used to decide the vertex.

In real world, if you throw something or when you dive into water, you draw a parabola. And this parabola represents that you can build a quadratic equation and draw a graph with it. The starting point of your throw will be the Y-intercept, and the highest point your object reaches will be the vertex and the maximum. And if the object reaches the ground, it represents the X-intercept. But you should know that in real world, there cannot be a ‘negative’, because distance or height cannot be a negative number.


Even if math and quadratic equations seem if they are very far from us unless we are mathematicians, but actually they are all around us.