engineering

Sajeongjeon

Sajeongjeon 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 Sajeongjeon rather than just read about it. In short: Sajeongjeon (Korean: 사정전; Hanja: 思政殿; lit. 'Thinking of Good Deeds Hall') is a building in the palace Gyeongbokgung in Seoul, South Korea. Description It is the main building of the p'yŏnjŏn (편전; 便殿).

Key takeaways

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

Reference excerpt

Sajeongjeon (Korean: 사정전; Hanja: 思政殿; lit. 'Thinking of Good Deeds Hall') is a building in the palace Gyeongbokgung in Seoul, South Korea.

Description It is the main building of the p'yŏnjŏn (편전; 便殿). This area of the palace is where the king performs his daily private work, similar to an office. The king generally spends more time in this area than in the chŏngjŏn. A ceremony called sangcham (상참; 常參) was held in Sajeongjeon, where officials would pay their respects to the king. The ceremony was supposed to be daily, although this was often not enforced. The king used the building as a preparation space before royal ceremonies. The building is on top of a three-tiered stone platform. The interior is a single large room that is elaborately painted with dancheong. A painted throne is in the north center of the room.

History It was completed in 1395. At the time, it was called "Bopyeongcheong" (보평청; 報平廳; Pop'yŏngch'ŏng), but soon afterwards it received its current name. It was named by the Korean official Chŏng Tojŏn based on a quote from the Chinese text Book of Documents. It was among the first structures in the palace. It was expanded in 1429. It was destroyed in the 1553 fire and rebuilt. After being destroyed in 1592 during the Imjin War, it was rebuilt in 1867. The building's exterior has since survived until the present, although its interior was modified when the building was used as an exhibit hall during the 1915 Chōsen Industrial Exhibition. A wall mural in the building was removed in the early 2000s for the purpose of preservation and replaced with a replica. The building has a counterpart entrance gate Sajeongmun (사정문; 思政門; Sajŏngmun) that was also rebuilt in 1867 and has remained to the present.

References

Sources 경복궁 변천사 (上) [History of Gyeongbokgung's Changes (Vol. 1)] (in Korean). Cultural Heritage Administration. August 2007. 이강근. "창건이후의 변천과정 고찰". In Cultural Heritage Administration (2007). 서울 역사 답사기 6: 종묘사직, 궁궐, 성균관 [A Survey of Seoul's History Vol. 6: Jongmyo Shrine, Palaces, and Sungkyunkwan] (in Korean). Seoul: Seoul Historiography Institute. 2022-11-14. ISBN 979-11-6071-148-6. 김웅호. "조선왕조를 대표하는 공간". In Seoul Historiography Institute (2022a). 이미지로 읽는 근대 서울 [Reading Modern Seoul Through Images] (in Korean). Vol. 1. 궁궐의 훼철과 박람회. Seoul Historiography Institute. October 30, 2022. ISBN 9791160711462. 조선시대 궁궐 용어해설 [Glossary of Joseon-era Palaces] (in Korean). Cultural Heritage Administration. 2009-12-07. ISBN 978-89-6325-247-6. 임석재 (2019-12-10). 예(禮)로 지은 경복궁: 동양 미학으로 읽다 [Gyeongbokgung, Built with Conscientiousness: An Eastern Art Perspective] (in Korean). 인물과사상사. ISBN 978-89-5906-551-6. Kim, Chang-Jun (1997-12-30). "일제 강점기의 경복궁(景福宮)훼손과 복원사업" [The Demolition of Gyeongbokgung During the Colonial Period and its Restoration]. Korean Journal of Heritage: History & Science (in Korean). 30: 63–79. ISSN 3022-8085 – via koreascience.or.kr.

External links Media related to Sajeongjeon at Wikimedia Commons

Illustrations

Worked examples

Example 1 — a first encounter with Sajeongjeon

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

In research: Sajeongjeon 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 Sajeongjeon 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: Sajeongjeon 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 1395, Gyeongbokgung, so understanding it makes those chapters shorter.
In everyday life: Look for Sajeongjeon 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 Sajeongjeon in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Sajeongjeon 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 Sajeongjeon out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Sajeongjeon in simple terms?

Sajeongjeon (Korean: 사정전; Hanja: 思政殿; lit. 'Thinking of Good Deeds Hall') is a building in the palace Gyeongbokgung in Seoul, South Korea. Description It is the main building of the p'yŏnjŏn (편전; 便殿).

Why does Sajeongjeon 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 Sajeongjeon?

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 Sajeongjeon.