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Souimun

Souimun is a engineering topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Souimun rather than just read about it. In short: Souimun (Korean: 소의문; Hanja: 昭義門; lit. 'Promotion of Justice Gate'; also known as Southwest Gate) was one of the Eight Gates of Seoul in the Fortress Wall of Seoul, South Korea, which surrounded the city in the Joseon period. It was also known as Seosomun (서소문; lit. 'West Small Gate').

Souimun — main illustration
Souimun — illustration

Key takeaways

  • Souimun belongs to engineering; place it in that map before memorising details.
  • Learn the definition first, then one example that makes the definition concrete.
  • Connect Souimun to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of Souimun from memory before moving on to harder problems.

Reference excerpt

Souimun (Korean: 소의문; Hanja: 昭義門; lit. 'Promotion of Justice Gate'; also known as Southwest Gate) was one of the Eight Gates of Seoul in the Fortress Wall of Seoul, South Korea, which surrounded the city in the Joseon period. It was also known as Seosomun (서소문; lit. 'West Small Gate'). During the early years of Japanese occupation, the gate was demolished. The Seoul Metropolitan Government has placed a marker roughly where the gate once stood.

History Souimun was originally built in 1396. The Japanese authorities had the gate torn down in 1914 during their colonial rule of the country.

Commemoration

A memorial marker has been erected near to where Souimun once stood. It is located next to a multi-storey car park structure, which is adjacent to the JoongAng Ilbo newspaper building on Seosomun-ro (street) in Jung District, Seoul.

References

Illustrations

Souimun illustration
Souimun: Souimun, Memorial marker, showing JoongAng Ilbo building in background.
Souimun, Memorial marker, showing JoongAng Ilbo building in background.

Worked examples

Example 1 — a first encounter with Souimun

Start with the simplest possible case. Write down what Souimun claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In engineering, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Souimun before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Souimun ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Souimun

In research
Souimun appears in engineering research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry
Engineering practice reuses Souimun in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom
Souimun is common in secondary-school and first-year university syllabi. It links to neighbouring topics Buildings and structures completed in 1396, Gates of Seoul, so understanding it makes those chapters shorter.
In everyday life
Look for Souimun outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.
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How to study Souimun in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Souimun means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain Souimun out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Souimun in simple terms?

Souimun (Korean: 소의문; Hanja: 昭義門; lit. 'Promotion of Justice Gate'; also known as Southwest Gate) was one of the Eight Gates of Seoul in the Fortress Wall of Seoul, South Korea, which surrounded the city in the Joseon period. It was also known as Seosomun (서소문; lit. 'West Small Gate').

Why does Souimun matter?

Because it connects several engineering ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Souimun?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Souimun.

Tags

  • Buildings and structures completed in 1396
  • Gates of Seoul

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