engineering

Sukjeongmun

Sukjeongmun 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 Sukjeongmun rather than just read about it. In short: Sukjeongmun (Korean: 숙정문; Hanja: 肅靖門; also known as North Gate) is one of the Eight Gates of Seoul in the Fortress Wall of Seoul, South Korea, which surrounded the city in the Joseon period. The gate is also known as Bukdaemun (북대문; 北大門; lit. 'North Big Gate').

Key takeaways

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

Reference excerpt

Sukjeongmun (Korean: 숙정문; Hanja: 肅靖門; also known as North Gate) is one of the Eight Gates of Seoul in the Fortress Wall of Seoul, South Korea, which surrounded the city in the Joseon period. The gate is also known as Bukdaemun (북대문; 北大門; lit. 'North Big Gate'). It was built north of Seoul behind Gyeongbokgung. It was rarely used. It was only used in ceremonious and symbolic functions. In order to visit, identification such as a passport is required for access.

History Sukjeongmun was originally built in 1396, and was originally called Sukcheongmun (肅淸門), but its name was modified slightly to its current name (肅靖門) in the early 16th century. Being situated so close to the Royal Palace of the Joseon Dynasty, it was rarely used for receiving visitors, and had more of a ceremonious function. The original wooden gatehouse over the gate was destroyed by fire, and the current gatehouse dates from 1976. The name Sukjeongmun means literally "Rule Solemnly Gate". It is one of the Four Great Gates (사대문) in the Fortress Wall of Seoul.

Preservation After the infiltration of North Korean agents during the Blue House Raid in 1968, both the gate and the surrounding area were closed off for security reasons. They were opened again for public touring by 2007.

Image gallery

Illustrations

Worked examples

Example 1 — a first encounter with Sukjeongmun

Start with the simplest possible case. Write down what Sukjeongmun 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 Sukjeongmun 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 Sukjeongmun 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 Sukjeongmun

In research: Sukjeongmun 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 Sukjeongmun 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: Sukjeongmun is common in secondary-school and first-year university syllabi. It links to neighbouring topics 14th-century establishments in Korea, Buildings and structures completed in 1396, Gates of Seoul, so understanding it makes those chapters shorter.
In everyday life: Look for Sukjeongmun 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 Sukjeongmun in 20 minutes

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

Frequently asked questions

What is Sukjeongmun in simple terms?

Why does Sukjeongmun 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 Sukjeongmun?

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 Sukjeongmun.