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스트레스는 공학에서 응력이라고 한다. 이것은 다음과 같이 정의된다. 물체가 어떤 하중을 받았을 때 그 값을 하중과 수직한 면의 단면적으로 나누는 것, 물론 공학적, 물리학적으로 더 복잡하게 얘기해야 하지만 개념적으로 단순히 이렇게 설명할 수 있다. 그렇다면 스트레스를 감소시키는 방법은 이 공식을 통해서 보면 2가지이다. 하중을 감소시키는 것 면적을 늘리는 것 공학적인 상황 즉 어떤 기계나 부품 혹은 제품 등에서는 보통 받는 하중 즉 견뎌야 하는 하중이란게 정해져 있을 때가 많다. 세탁기가 받는 하중을 줄이는 것은 힘든 일이다. 어차피 세탁해야 할 빨래의 하중이 정해져 있다보니... 그래서 보통 주어진 하중을 잘 견딜 수 있는 단면적을 가진 형상으로 디자인을 한다. 사람이 받는 스트레스 또한 이런 관점으로..

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..