7.Recently the extent of Aretic sea ice at the end of summer is frequently reported to record its lowest, which suggests the sea joe extent is gradually decreasing with a warming climate. What effect may this have on the Earth's climate? (10 pst)

8. In the boreal forest region, the vegetation type is gometimes different between norti-facing and south-facing slopes. For example, in Interior Alask cing slope is co covered by black spruce forest over er permafrost. In contrast, the south-facing slope is covered by deciduous broadleaf species on the permafirost-free soil. Explain the reason for it from the view of solar radintion and topography. (10 pt)

9.The maximum of daily mean solar radiation occurs in the Aretic and Antarctic regions seasonally, not in the equator. Explain this phenomenon and the reason why. (10 pt) 

一、請說明森林經營規劃方面,會使用到哪些技術或知識?請列舉至少3項技術或知識加以說明,並闡述彼此關係?

二、面對氣候變遷在森林經營方面有何因應策略?

三、國有林與私有林在森林經營方面,有甚麼相同及相異之處?

四、我國木材長年仰賴進口,請說明長期此種情形,對於台灣森林經營有哪些負面影響?有何因應對策?

1.(20%) Given a string c consist of"!" and "I" symbols, for every right parenthesis there exists a matching left parenthesis, we said that string is a balanced parentheses sequ quence. For example, are balanced parentheses sequence. On the other hand, are not balanced parentheses sequence. Plcase implement a function balanced_ parenthese (seq) which takes one string seq as the parameter. The function wil return true if the string seg is a balanced parentheses sequence or false otherwise.

a.(10%) According to the sentence "this is an example of a buffman tree", please generate the Huffman code tablc and encode the above sentence with your code table.

b.(10%) Given a string S which consist of space char and lower case letters (i.e.,', 'a', ...,'2), implement a function huffman_code (str) which can output the huffiman code table which is optimized to the input string S and convert the str into a bit pattem according to the generated hufiman code table.

3.(20%) A sum-product number in a given number base b is a natural number that is equal to the product of the sum of its digits and the product of its digits. For example, the number ]44 in base 10 is a sum- -product numbet, because 1 + 4 + 4= 9, (1)(4)(4) = 16, and (9) (16)= 144. Please implement a function is_ sum product_ number (x) to check whether a natural number x is a sum-product number in base 10.

110年 - 110 國立臺灣大學_碩士班招生考試_森林環境暨資源研究所乙組:氣象學#100868