science

Pyeonjeon

Pyeonjeon is a science 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 Pyeonjeon rather than just read about it. In short: Aegisal ("애기살" or "baby arrow" or sometimes "mini-arrow") or Pyeonjeon, (aka "(편전)", "Junjun") is a short arrow or bolt, shot using a longer bamboo arrow guide called the Deotsal (Tong-ah) in Korean archery. The tongah (aka "Tong-ah") allows one to draw a short arrow at a full draw length with a full sized bow, it is an overdraw device.

Key takeaways

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

Reference excerpt

Aegisal ("애기살" or "baby arrow" or sometimes "mini-arrow") or Pyeonjeon, (aka "(편전)", "Junjun") is a short arrow or bolt, shot using a longer bamboo arrow guide called the Deotsal (Tong-ah) in Korean archery. The tongah (aka "Tong-ah") allows one to draw a short arrow at a full draw length with a full sized bow, it is an overdraw device. A tongah used with a bow looks somewhat similar to a crossbow. The Japanese had a similar arrow called a "Kudaya", that was loosed through a pipe.

Advantages There are several advantages in shooting a shorter arrow, the shorter arrow is lighter (which means they're faster) and more aerodynamic. They shoot with a higher velocity which results in greater range and hits the target more quickly. Their speed and small size also made it harder for enemies to see them coming. Their higher speed and aerodynamic efficiency means they penetrate armour better at range. Broken arrows could also be recycled into short arrows. In military archery, infantry troops with bows and arrows on the ground routinely used boys behind the front line to run and collect the arrows fired by the enemy that missed. This quickly re-supplied the front line troops with the missiles used against them that went too high or to the sides of the unit. A number of efforts over time were invented to prevent the enemy from responding with the arrows fired against them. The Pyeonjeon is one method, as opposing forces who lacked an overdraw device/tong-ah would be unable to use the short arrows on the field (though experienced opposition archers who figured out how the Pyeonjeon was fired or who were already equipped with an overdraw device similar to the tong-ah may have been able to re-use such arrows).

Historical use Used by the Koreans, this weapon was considered a national secret during the Japanese invasions of Korea (1592-1598). Its traditional range is 350 meters, five times the effective range of Arquebus or Tanegashima. Further more, the short bolts had longer range and flatter trajectory with a faster velocity and penetrating power. Tongah and pyeonjeon were part of the standard kit of Joseon era archers. Their quivers held 20 arrows and 10 pyeonjeon arrows.

Other similar devices The Chinese bian jian(邊箭), Byzantine solenarion and Turkish majra were all similar devices

In media The 2011 Korean film War of the Arrows depicted the protagonist fashioning a tongah while on the run in order to shoot some broken arrows. In the 2013 Korean drama Empress Ki, the protagonist Seung Nyang is an expert with the Pyeonjeon. In the 2014 Korean period action film The Fatal Encounter, the protagonist King Jeongjo uses the Pyeonjeon several times against long-range archers during an assassination attempt on him.

References

… excerpt ends here. Continue reading the full article.

Worked examples

Example 1 — a first encounter with Pyeonjeon

Start with the simplest possible case. Write down what Pyeonjeon claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, 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 Pyeonjeon 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 Pyeonjeon 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 Pyeonjeon

In research: Pyeonjeon appears in science 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 Pyeonjeon 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: Pyeonjeon is common in secondary-school and first-year university syllabi. It links to neighbouring topics Archery, Archery in South Korea, Arrow types, so understanding it makes those chapters shorter.
In everyday life: Look for Pyeonjeon 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 Pyeonjeon in 20 minutes

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

Frequently asked questions

What is Pyeonjeon in simple terms?

Why does Pyeonjeon matter?

Because it connects several science 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 Pyeonjeon?

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 Pyeonjeon.