Yoonkyung Yuh*⋅Jaehwan Yang**

(1)

(2)

Ⅰ

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(5)

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(7)

(8)

(9)

(10)

_{ } _{ }

_{ } _{ }

_{ } _{   }



_{ } _{   }      _{ }

    

  

_   ^^{ }^{ }^^

(11)

(12)

   



  



  ^

__ __



_  _



    _

 



_    

_

 _^ _^  _^  _^  _^

_^ _^ 



(13)

 _{  }^    _^_^ _{  }^   _{  }^ _^ _{  }^   _{  }^ _^

_^ _^   



 _

 _    

_^{  }



_  





(14)

 _    

  



_ 

 _

  



  



  

^

  

  _



^



_

  ^

  _ _

   ^

 ∙ _ _ _ 





 _   …    

_≥    …    

_{  }  _ _ _     …  

_≤_   …    

_    

 

 _



(15)

_ _



_

_

_

_

_^{ }  __^ _^  __^ _^





_^ _^

 

(16)

 _

      

  …     _



    _

_ 





(17)

(18)



 

(19)





(20)

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(22)

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(27)

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(36)

Yoonkyung Yuh^*⋅Jaehwan Yang^**