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Ȩ Ȩ > ¿¬±¸¹®Çå > ±¹³» ³í¹®Áö > Çѱ¹Á¤º¸Åë½ÅÇÐȸ ³í¹®Áö (Journal of the Korea Institute of Information and Communication Engineering)

Çѱ¹Á¤º¸Åë½ÅÇÐȸ ³í¹®Áö (Journal of the Korea Institute of Information and Communication Engineering)

Current Result Document :

ÇѱÛÁ¦¸ñ(Korean Title) ±¤¼± ½´Æà ¹®Á¦¸¦ À§ÇÑ º¼·Ï ·¹À̾î Æ®¸®
¿µ¹®Á¦¸ñ(English Title) A Convex Layer Tree for the Ray-Shooting Problem
ÀúÀÚ(Author) ±è¼öȯ   Soo-Hwan Kim  
¿ø¹®¼ö·Ïó(Citation) VOL 21 NO. 04 PP. 0753 ~ 0758 (2017. 04)
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(Korean Abstract)
±¤¼± ½´Æà ¹®Á¦´Â ÁÖ¾îÁø ±âÇÏ °´Ã¼µé¿¡ ´ëÇؼ­ Á÷¼±À» µû¶ó¼­ À̵¿ÇÏ´Â ±¤¼±ÀÌ Ã³À½À¸·Î ºÎµúÈ÷´Â °´Ã¼ÀÇ Á¡À» ã´Â ¹®Á¦ÀÌ´Ù. ±¤¼±Àº º¸Åë ÁúÀÇÀÇ ÇüÅ·ΠÁÖ¾îÁö±â ¶§¹®¿¡, ÀÌ ¹®Á¦ÀÇ ÀϹÝÀûÀÎ ÇعýÀº ´ÙÀ½°ú °°´Ù. ¸ÕÀú, Àüó¸® °úÁ¤À¸·Î, ÁÖ¾îÁø °´Ã¼µé¿¡ ´ëÇÑ ÀڷᱸÁ¶¸¦ ±¸ÃàÇÑ´Ù. ±× ´ÙÀ½, ÀÌ ÀڷᱸÁ¶¸¦ ÀÌ¿ëÇÏ¿© °¢ ÁúÀÇ¿¡ ´ëÇÑ ´äÀ» ºü¸£°Ô ±¸ÇÑ´Ù. º» ³í¹®¿¡¼­´Â Ãà »ó¿¡ ³õÀÎ ¼öÁ÷ ¼±ºÐµé ÁýÇÕ¿¡ ´ëÇÑ ±¤¼± ½´Æà ¹®Á¦¸¦ °í·ÁÇÑ´Ù. º» ³í¹®¿¡¼­´Â ÀÔ·ÂÀ¸·Î ÁÖ¾îÁø n°³ÀÇ ¼öÁ÷ ¼±ºÐµé¿¡ ´ëÇØ º¼·Ï ·¹À̾î Æ®¸®¶ó°í ºÎ¸£´Â »õ·Î¿î ÀڷᱸÁ¶¸¦ Á¦½ÃÇÑ´Ù. ÀÌ°ÍÀº ¼öÁ÷ ¼±ºÐµéÀÇ º¼·Ï ¿ÜÇǵéÀÇ ·¹À̾î·Î ±¸¼ºµÇ´Â ÀÌÁø Æ®¸®ÀÌ´Ù. ÀÌ Æ®¸®´Â O(nlogn) ½Ã°£°ú O(n) °ø°£ÀÇ ¾Ë°í¸®ÁòÀ¸·Î ±¸ÃàµÇ¸ç ±¸ÇöÀÌ ¿ëÀÌÇÏ´Ù. ¶ÇÇÑ ÀÌ ÀڷᱸÁ¶¸¦ »ç¿ëÇÏ¿© °¢ ÁúÀǸ¦ O(nlogn) ½Ã°£¿¡ ¼öÇàÇÏ´Â ¾Ë°í¸®ÁòÀ» Á¦½ÃÇÑ´Ù.
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(English Abstract)
The ray-shooting problem is to find the first intersection point on the surface of given geometric objects where a ray moving along a straight line hits. Since rays are usually given in the form of queries, this problem is typically solved as follows. First, a data structure for a collection of objects is constructed as preprocessing. Then, the answer for each query ray is quickly computed using the data structure. In this paper, we consider the ray-shooting problem about the set of vertical line segments on the -axis. We present a new data structure called a convex layer tree for n vertical line segments given by input. This is a tree structure consisting of layers of convex hulls of vertical line segments. It can be constructed in O(nlogn) time and O(n) space and is easy to implement. We also present an algorithm to solve each query in O(nlogn) time using this data structure.
Å°¿öµå(Keyword) ÀÌÁø Æ®¸®   °è»ê±âÇÏÇР  º¼·Ï ¿ÜÇÇ   ±¤¼± ½´Æà  Binary tree   Computational geometry   Convex hull   Ray-shooting  
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