engineering

Kami-Akasaka Castle

Kami-Akasaka Castle 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 Kami-Akasaka Castle rather than just read about it. In short: Kami-Akasaka Castle (上赤坂城, Kami-Akasaka-jō) is a late Kamakura period Japanese castle located in the village of Chihayaakasaka, Osaka Prefecture, Japan. Its ruins have been protected as a National Historic Site since 1934.

Key takeaways

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

Reference excerpt

Kami-Akasaka Castle (上赤坂城, Kami-Akasaka-jō) is a late Kamakura period Japanese castle located in the village of Chihayaakasaka, Osaka Prefecture, Japan. Its ruins have been protected as a National Historic Site since 1934. It is also referred to as Kusunoki Castle (楠木城, Kusunoki-jō) or Kiriyama Castle (桐山城, Kiriyama-jō),

History Kami-Akasaka Castle is located at a ridge extending from Mount Kongō on the border of Kawachi Province with the Yoshino region of Yamato Province. It was the center of a defensive position which included many smaller fortifications on surrounding hills. Shimo-Akasaka Castle is located at a lower level opposite a small river. In 1331, when Emperor Go-Daigo attempted to overthrow the Kamakura shogunate in the Genkō War, he relied on Prince Moriyoshi and a local lord from the Chihaya-Akasaka area, Kusunoki Masashige to raise an army. However, this first attempt failed, and Emperor Go-Daigo was captured and exiled to the Oki Islands and Kusunoki Masashige faked his death at the Siege of Akasaka and escaped into the deep mountains of his own territory where he constructed Kami-Akasaka Castle and Chihaya Castle. The castle was consisted of several enclosures protected by dry moats, spread over the mountain and formed a letter "H" connecting two peaks and the intervening saddle. From the entry to the inner enclosures was a narrow path with several gates. In early 1333, Kusunoki Masashige joined forces with Prince Moriyoshi and recovered Shimo-Akasaka Castle and resumed his offense against the shogunate. The shogunate responded with a large army which laid siege to Kami-Akasaka Castle, which was defended by Kusunoki Masashige's brother Kusunoki Masasue. The castle fell after two weeks, once the shogunate army had managed to break the water supply to the defenders. After the Kenmu restoration, Kami-Akasaka Castle continued to be used as a base for the Southern Court during the wars of the Nanboku-chō period, but fell to Northern Court forces in 1360. It is now largely ruins with little remaining evidence of the original structure.

Gallery

See also List of Historic Sites of Japan (Osaka)

References

Further reading De Lange, William (2021). An Encyclopedia of Japanese Castles. Groningen: Toyo Press. pp. 600 pages. ISBN 978-9492722300. Frederic, Louis (2002). "Chihaya-jō." Japan Encyclopedia. Cambridge, Massachusetts: Harvard University Press. Sansom, George (1961). "A History of Japan: 1334-1615." Stanford, California: Stanford University Press. pp123–4 Turnbull, Stephen (1998). 'The Samurai Sourcebook'. London: Cassell & Co. Motoo, Hinago (1986). Japanese Castles. Tokyo: Kodansha. pp. 200 pages. ISBN 0-87011-766-1.

External links Media related to Kamiakasakajyo at Wikimedia Commons

Illustrations

Worked examples

Example 1 — a first encounter with Kami-Akasaka Castle

Start with the simplest possible case. Write down what Kami-Akasaka Castle 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 Kami-Akasaka Castle 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 Kami-Akasaka Castle 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 Kami-Akasaka Castle

In research: Kami-Akasaka Castle 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 Kami-Akasaka Castle 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: Kami-Akasaka Castle is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1330s establishments in Japan, Buildings and structures completed in 1332, Castles in Osaka Prefecture, so understanding it makes those chapters shorter.
In everyday life: Look for Kami-Akasaka Castle 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 Kami-Akasaka Castle in 20 minutes

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

Frequently asked questions

What is Kami-Akasaka Castle in simple terms?

Why does Kami-Akasaka Castle 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 Kami-Akasaka Castle?

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 Kami-Akasaka Castle.