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Current Result Document : 24 / 41 ÀÌÀü°Ç ÀÌÀü°Ç   ´ÙÀ½°Ç ´ÙÀ½°Ç

ÇѱÛÁ¦¸ñ(Korean Title) SSQUSAR : Apache Spark SQLÀ» ÀÌ¿ëÇÑ ´ë¿ë·® Á¤¼º °ø°£ Ã߷бâ
¿µ¹®Á¦¸ñ(English Title) SSQUSAR : A Large-Scale Qualitative Spatial Reasoner Using Apache Spark SQL
ÀúÀÚ(Author) ±èÁ¾ÈÆ   ±èÀÎö   Jonghoon Kim   Incheol Kim  
¿ø¹®¼ö·Ïó(Citation) VOL 06 NO. 02 PP. 0103 ~ 0116 (2017. 02)
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(Korean Abstract)
º» ³í¹®¿¡¼­´Â Apache Spark SQLÀ» ÀÌ¿ëÇÏ¿© ÀÓÀÇÀÇ µÎ °ø°£ °´Ã¼µé °£ÀÇ À§»ó °ü°è¿Í ¹æÇâ °ü°è¸¦ ³ªÅ¸³»´Â »õ·Î¿î Á¤¼º °ø°£ Áö½ÄÀ» È¿À²ÀûÀ¸·Î Ãß·ÐÇس»´Â ´ë¿ë·® Á¤¼º °ø°£ Ã߷бâÀÇ ¼³°è¿Í ±¸Çö¿¡ ´ëÇØ ¼Ò°³ÇÑ´Ù. Apache Spark SQLÀº Hadoop Ŭ·¯½ºÅÍ ÄÄÇ»ÅÍ ½Ã½ºÅÛ¿¡¼­ ´Ù¾çÇÑ µ¥ÀÌÅÍµé °£ÀÇ ¸Å¿ì È¿À²ÀûÀÎ Á¶ÀÎ ¿¬»ê°ú ÁúÀÇ Ã³¸® ±â´ÉÀ» Á¦°øÇÏ´Â ºÐ»ê º´·Ä ÇÁ·Î±×·¡¹Ö ȯ°æÀÌ´Ù. º» °ø°£ Ã߷б⿡¼­´Â Á¤¼º °ø°£ Ãß·ÐÀÇ Àüü °úÁ¤À» Áö½Ä ÀÎÄÚµù, ¿ª °ü°è Ãß·Ð, µ¿ÀÏ °ü°è Ãß·Ð, ÀÌÇà °ü°è Ãß·Ð, °ü°è Á¤Á¦, Áö½Ä µðÄÚµù µî Å©°Ô ÃÑ 6°³ÀÇ ÀÛ¾÷µé·Î ³ª´©°í, ³í¸®Àû Àΰú°ü°è¿Í °è»ê È¿À²¼ºÀ» °í·ÁÇÏ¿© ÀÛ¾÷µé °£ÀÇ Ã³¸® ¼ø¼­¸¦ °áÁ¤ÇÏ¿´´Ù. Áö½Ä ÀÎÄÚµù ÀÛ¾÷¿¡¼­´Â Ãß·ÐÀÇ Àüó¸® °úÁ¤À¸·Î¼­ XML/RDF ÇüÅÂÀÇ ÀÔ·Â Áö½ÄÀ» º¸´Ù °£·«ÇÑ ³»ºÎ ÇüÅ·Πº¯È¯ÇÔÀ¸·Î½á, Ãß·Ð ´ë»óÀÎ Áö½Ä º£À̽ºÀÇ Å©±â¸¦ Ãà¼Ò½ÃÄ×´Ù. ÀϹÝÀûÀ¸·Î ÀÌÇà °ü°è Ãß·Ð ÀÛ¾÷°ú °ü°è Á¤Á¦ ÀÛ¾÷ÀÇ ¹Ýº¹Àº Á¤¼º °ø°£ Ã߷п¡ ÇÊ¿äÇÑ °¡Àå ¸¹Àº °è»ê ½Ã°£°ú ±â¾ï °ø°£À» ¼Ò¸ðÇÑ´Ù. ÀÌ ÀÛ¾÷µéÀ» È¿À²È­Çϱâ À§ÇØ º» °ø°£ Ã߷б⿡¼­´Â °ø°£ Ã߷п¡ ÇÊ¿äÇÑ ÃÖ¼ÒÇÑÀÇ ÀÌÁ¢ °ü°èµéÀ» ã¾Æ³»°í, À̵éÀ» ±â¹ÝÀ¸·Î ÀÌÇà °ü°è Ãß·ÐÀ» À§ÇÑ Á¶ÇÕÇ¥¸¦ Å« ÆøÀ¸·Î Ãà¼ÒÇÏ°í °ü°è Á¤Á¦ ÀÛ¾÷µµ ÃÖÀûÈ­ÇÏ¿´´Ù. ´ë±Ô¸ð º¥Ä¡¸¶Å· °ø°£ Áö½Ä º£À̽º¸¦ ÀÌ¿ëÇÑ ½ÇÇèÀ» ÅëÇØ, º» ³í¹®¿¡¼­ Á¦¾ÈÇÏ´Â ´ë¿ë·® Á¤¼º °ø°£ Ã߷бâÀÇ ³ôÀº Ãß·Ð ¼º´É°ú È®À强À» È®ÀÎÇÏ¿´´Ù.
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(English Abstract)
In this paper, we present the design and implementation of a large-scale qualitative spatial reasoner, which can derive new qualitative spatial knowledge representing both topological and directional relationships between two arbitrary spatial objects in efficient way using Aparch Spark SQL. Apache Spark SQL is well known as a distributed parallel programming environment which provides both efficient join operations and query processing functions over a variety of data in Hadoop cluster computer systems. In our spatial reasoner, the overall reasoning process is divided into 6 jobs such as knowledge encoding, inverse reasoning, equal reasoning, transitive reasoning, relation refining, knowledge decoding, and then the execution order over the reasoning jobs is determined in consideration of both logical causal relationships and computational efficiency. The knowledge encoding job reduces the size of knowledge base to reason over by transforming the input knowledge of XML/RDF form into one of more precise form. Repeat of the transitive reasoning job and the relation refining job usually consumes most of computational time and storage for the overall reasoning process. In order to improve the jobs, our reasoner finds out the minimal disjunctive relations for qualitative spatial reasoning, and then, based upon them, it not only reduces the composition table to be used for the transitive reasoning job, but also optimizes the relation refining job. Through experiments using a large-scale benchmarking spatial knowledge base, the proposed reasoner showed high performance and scalability.
Å°¿öµå(Keyword) Á¤¼º °ø°£ Ã߷Р  Spark SQL   À§»ó °ü°è   ÃÖ¼Ò ÀÌÁ¢ °ü°èµé   ºÐ»ê º´·Ä ÇÁ·Î±×·¡¹Ö   Qualitative Spatial Reasoning   Spark SQL   Topological Relation   Minimal Disjunctive Relation   Distributed Parallel Programming  
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