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스트레스(Stress)는 우리 삶속에서 제거하고 싶지만 제거되지 않고, 쌓고 싶지 않지만 쌓여 있는 가깝고도 먼 존재인 것 같습니다. 스트레스를 해소하는 것도 중요하고 예방하는 것도 중요합니다. 스트레스가 무엇인지 아는 것도 좋은 시작점이 될 것입니다. 스트레스의 정의는 다양하겠지만 공학적 측면에서 스트레스를 살펴보려고 합니다. 다른 시야에서 오는 새로운 접근이 되었으면 하는 바람입니다. 스트레스는 기계공학에서 응력이라고 번역을 합니다. 간단히 정의를 내린다면 "어떤 물체가 외력을 받으면 변형이 발생한다. 이 변형을 막기 위해 내부에는 저항력이 생성되어 외력과 평형을 이룬다. 이 저항력을 내력이라고 할 수 있고, 단위면적당 내력의 크기를 응력(Stress)이라고 정의한다." 기계공학과에 입학하여 2학년이..

Not boringly, maybe you will see politicians who makes a reckless remark through periodic media. Why say that! No one should! Why?? No matter how much they have said good things, suddenly say something like bomb for sensitive problems. for example, Dokdo problems, Sexual slavery victims problems, pro-Japanese problems, etc.. People say to them 'Please do not say like that' but it repeats shortly..

There is a phenomenon called springback. We can easily experience bending the wire and then releasing the hand to deform less than it was bent. At this time, the wire is restored to its original state. Although the transformation of 100 was applied, only about 80 was maintained and the remaining 20 were released. This is due to the'resilience' of the material. The more resilient material is, the..

The Planklin Planner is globally popular. Isn't this the desire of people who want to live well with plans? Practice is more important than grand planning. But we often fail. Because there are so many unforeseen things that hinder our plans. So, Focus on planning within a predictable period to achieve a sense of accomplishment. Let's make a long-term plan gradually. First, let's focus on the pla..

In the last article, we talked about differentiation and the possibility of differentiation in our lives (see the last article). If life is simple, continuous, and there is no sudden situation, there will be no difficulty in predicting the future. Mathematically, such a function is called a'smooth function'. It's a name that gives you a rough idea of which function you need, even without explana..

Why can't we know the future exactly? There are too many variables in our lives. How many variables can most people predict? About two? It will vary from person to person. It is difficult for the average person to predict more than the speed and direction of the car at the same time (see previous article). On the other hand, there are so many variables in our lives. So it is not easy to predict ..

What is differential. Math? Science? Is it a difficult story? Differentiation is generally considered to be a'difficult story'. It is often referred to as a typical concept far from everyday life. Even the math teacher said this. 'Is it useful to learn differentiation?' 'Would you like to solve the differential equation when calculating change in the supermarket?' It is the'differentiated useles..

Linear is... If there are 20 changes when you first try 10, It is a state where you can get 200 values with 100 efforts. So the linearity is predictable. 10 —> 20 100 —> 200 Nonlinear is... It is 20 when 10 efforts are made, It is a situation where even if you try as much as 100, 50 changes may occur, or 400 changes may occur. So non-linearity is difficult to predict. In the graph below, The lef..