physics

Sim Sang-jung

Sim Sang-jung is a physics 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 Sim Sang-jung rather than just read about it. In short: Sim Sang-jung (Korean: 심상정; born 20 February 1959) is a South Korean labor rights activist and former politician. She was one of the five major presidential candidates in the 2017 South Korean presidential election, running as the Justice Party's nominee.

Key takeaways

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

Reference excerpt

Sim Sang-jung (Korean: 심상정; born 20 February 1959) is a South Korean labor rights activist and former politician. She was one of the five major presidential candidates in the 2017 South Korean presidential election, running as the Justice Party's nominee. She again ran as the Justice Party's nominee in the 2022 presidential election, finishing in 3rd place. She has been a member of the National Assembly since 2012, having previously served from 2004 to 2008, and was the leader of the Justice Party from 2015 to 2017 and 2019 to 2020. She announced her retirement from politics following the 2024 legislative election, effective at the end of the National Assembly's term on 29 May.

Education and early career Sim obtained her bachelor's degree in education from Seoul National University. She switched degrees from history, with the aspiration to become a history teacher. At the age of 21, she worked at a cassette tape factory where her days as a labor rights activist began. Sim was subsequently fired for mobilizing workers to demand higher wages and better meals. She "hopped from job to job" to earn a wage but continued her labor activism. In 1985, she was on the country's most wanted list for instigating labor strikes. She was on the list for 9 years, and married her husband, a fellow activist, during that time. She was formally charged for 'instigation of mass harm' and 'instigation of arson', and was sentenced to 1.5 years imprisonment, but a 2-year suspended sentence, soon after she became pregnant.

Political career Sim was first elected in 2004 in the 17th National Assembly as a member of the Democratic Labor Party. She won her first direct election in the 19th National Assembly as a member of the UPP with 49.37% of the votes in an area of Gyeonggi Goyang in 2012. Following the disintegration of the Unified Progressive Party after the Park Geun-hye government's petition to the Constitutional Court of Korea for the UPP's alleged pro-North Korean views in 2013, Sim helped found the Justice Party. She was elected party chair in 2015. Sim won another seat in the 20th National Assembly in 2016, again in an area of Goyang with 53% of the vote. In the 2020 election, she defeated Moon Myung-soon from Democratic Party and Lee Kyung-hwan from the United Future Party, becoming the first four-term parliamentarian from a progressive party in Korea. She announced her retirement from politics following the 2024 legislative election after the Justice Party failed to win seats for the first time since its foundation.

Political positions and ideology

Economy Her economic positions reflect the progressive platform of the Justice Party. This includes reforming chaebols (Korean conglomerates) so that hereditary succession is banned. Her key policy in the 2022 South Korean election was the proposal of a four-day work week, which has been described as "a revolutionary idea in a country where workers endure notoriously long hours".

Social issues In the 2017 South Korean presidential election, Sim was the only major presidential candidate to openly support LGBT rights in South Korea.

National security Sim opposes the deployment of THAAD, a U.S. anti ballistics missile defense system, and supports a nuclear-free Korean Peninsula.

Feminism Sim self-identifies as a feminist. She has said that, "Sexism clearly exists in South Korean society". Polling in the 2022 South Korean presidential election suggested her strongest support came from women in their 20s. Vladimir Tikhonov, professor of Korean studies at the University of Oslo, has said that some younger women consider her a hero for what he describes as being able to "articulate the women's rights agenda".

Election results

References

External links Official website (in Korean) Sim Sang-jung on X

Illustrations

Worked examples

Example 1 — a first encounter with Sim Sang-jung

Start with the simplest possible case. Write down what Sim Sang-jung claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In physics, 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 Sim Sang-jung 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 Sim Sang-jung 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 Sim Sang-jung

In research: Sim Sang-jung appears in physics 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 Sim Sang-jung 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: Sim Sang-jung is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1959 births, Anti-nuclear activists, Cheongsong Sim clan, so understanding it makes those chapters shorter.
In everyday life: Look for Sim Sang-jung 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 Sim Sang-jung in 20 minutes

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

Frequently asked questions

What is Sim Sang-jung in simple terms?

Why does Sim Sang-jung matter?

Because it connects several physics 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 Sim Sang-jung?

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 Sim Sang-jung.