<?xml version="1.0" encoding="utf-8"?>
<journal>
<title>Journal of Watershed Management Research</title>
<title_fa>پ‍‍ژوهشنامه مديريت حوزه آبخيز</title_fa>
<short_title>J Watershed Manage Res</short_title>
<subject>Agriculture</subject>
<web_url>http://jwmr.sanru.ac.ir</web_url>
<journal_hbi_system_id>1</journal_hbi_system_id>
<journal_hbi_system_user>admin</journal_hbi_system_user>
<journal_id_issn>2251-6174</journal_id_issn>
<journal_id_issn_online>2676-4636</journal_id_issn_online>
<journal_id_pii></journal_id_pii>
<journal_id_doi>10.61882/jwmr</journal_id_doi>
<journal_id_iranmedex></journal_id_iranmedex>
<journal_id_magiran></journal_id_magiran>
<journal_id_sid></journal_id_sid>
<journal_id_nlai></journal_id_nlai>
<journal_id_science></journal_id_science>
<language>fa</language>
<pubdate>
	<type>jalali</type>
	<year>1390</year>
	<month>2</month>
	<day>1</day>
</pubdate>
<pubdate>
	<type>gregorian</type>
	<year>2011</year>
	<month>5</month>
	<day>1</day>
</pubdate>
<volume>2</volume>
<number>3</number>
<publish_type>online</publish_type>
<publish_edition>1</publish_edition>
<article_type>fulltext</article_type>
<articleset>
	<article>


	<language>fa</language>
	<article_id_doi></article_id_doi>
	<title_fa>بررسی تأثیر تعدیل دامنه تغییرات داده ها بر کارایی مدل شبکه عصبی مصنوعی و درخت تصمیم رگرسیونی در پیش بینی خشکسالی</title_fa>
	<title></title>
	<subject_fa>تخصصي</subject_fa>
	<subject>Special</subject>
	<content_type_fa>پژوهشي</content_type_fa>
	<content_type>Research</content_type>
	<abstract_fa>&lt;!--stripped--&gt;
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   &lt;w:WrapTextWithPunct/&gt;
   &lt;w:UseAsianBreakRules/&gt;
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   &lt;w:SplitPgBreakAndParaMark/&gt;
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&lt;!--stripped--&gt;&lt;b&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 12pt font-family: &quot;2  Nazanin&quot;&quot; dir=&quot;rtl&quot;&gt;خشکسالی یکی از اثرات تغییر سامانه
اقلیمی است. پیش بینی خشکسالی نقش مهمی در اعمال روش های مؤثر مدیریت منابع آب ایفا می کند. روش های مختلفی برای مطالعه خشکسالی
وجود دارد. روش تحلیل داده های بارندگی، جزء عمومی روش‌های تحلیل خشکسالی به شمار
می‌رود. لذا پیش بینی دقیق و پیش از وقوع بارش می تواند شرایط را برای ارزیابی
وضعیت خشکسالی فراهم نماید. هدف از این پژوهش، بررسی تا&lt;/span&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 12pt font-family: &quot;B Nazanin&quot;&quot; dir=&quot;rtl&quot;&gt;ٔ&lt;/span&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 12pt font-family: &quot;2  Nazanin&quot;&quot; dir=&quot;rtl&quot;&gt;ثیر پیش
پردازش داده ها بر عملکرد دو مدل داده کاوی در پیش بینی خشکسالی در ایستگاه
سینوپتیک یزد می باشد. در این رابطه از دو روش شبکه عصبی مصنوعی و درخت تصمیم
رگرسیونی که از انواع روش های داده کاوی محسوب می شود استفاده شد و شبیه سازی ها
در دو حالت کلی صورت گرفت. در حالت اول، از مقادیر اصلی برخی پارامترهای اقلیمی استفاده
و میزان بارش 12 ماه پیش از وقوع پیش بینی گردید. در حالت دوم میانیگن متحرک سه
ساله همان داده ها به مدل معرفی و پیش بینی بر همین اساس انجام شد. در پایان برای
ارزیابی دقت و درستی دو روش مورد استفاده، معیارهای آماری&lt;/span&gt;&lt;span style=&quot;font-size: 10pt font-family: &quot;Times New Roman&quot;,&quot;serif&quot;&quot;&gt;RMSE &lt;/span&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 10pt font-family: &quot;2  Nazanin&quot;&quot; dir=&quot;rtl&quot;&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;، &lt;/span&gt;&lt;span style=&quot;font-size: 10pt font-family: &quot;Times New Roman&quot;,&quot;serif&quot;&quot;&gt;R&lt;/span&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;&lt;span style=&quot;font-size: 10pt font-family: &quot;2  Nazanin&quot;&quot; dir=&quot;rtl&quot;&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt; &lt;/span&gt;&lt;span lang=&quot;FA&quot; style=&quot;font-size: 12pt font-family: &quot;2  Nazanin&quot;&quot; dir=&quot;rtl&quot;&gt;مورد استفاده قرار گرفت&lt;/span&gt;&lt;span dir=&quot;ltr&quot;&gt;&lt;/span&gt;&lt;span style=&quot;font-size: 12pt font-family: &quot;Times New Roman&quot;,&quot;serif&quot;&quot;&gt;&lt;span dir=&quot;ltr&quot;&gt;&lt;/span&gt;.&lt;/span&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt;&lt;span style=&quot;font-size: 12pt font-family: &quot;2  Nazanin&quot;&quot; dir=&quot;rtl&quot;&gt;&lt;span dir=&quot;rtl&quot;&gt;&lt;/span&gt; &lt;span lang=&quot;FA&quot;&gt;یافته ها نشان داد
که اعمال&lt;span&gt; &lt;/span&gt;میانگین لغزان روی داده های اصلی به نحو چشمگیری در بهبود کارایی هر دو مدل مؤثر می باشد و در این
شرایط هر دو روش درخت تصمیم رگرسیونی و شبکه عصبی مصنوعی در ایستگاه یزد قادرند با
ضریب اطمینان بالایی میزان بارش را 12 ماه پیش از وقوع برآورد نمایند.&lt;/span&gt;&lt;/span&gt;&lt;/b&gt;&lt;div style=&quot;text-align: right&quot;&gt; &lt;/div&gt;</abstract_fa>
	<abstract></abstract>
	<keyword_fa>پیش بینی، خشکسالی، شبکه عصبی مصنوعی، درخت تصمیم رگرسیونی، داده کاوی</keyword_fa>
	<keyword></keyword>
	<start_page>63</start_page>
	<end_page>79</end_page>
	<web_url>http://jwmr.sanru.ac.ir/browse.php?a_code=A-10-1-21&amp;slc_lang=fa&amp;sid=1</web_url>


<author_list>
	<author>
	<first_name></first_name>
	<middle_name></middle_name>
	<last_name></last_name>
	<suffix></suffix>
	<first_name_fa>اعظم </first_name_fa>
	<middle_name_fa></middle_name_fa>
	<last_name_fa>حبیبی پور</last_name_fa>
	<suffix_fa></suffix_fa>
	<email></email>
	<code>1003194753284600586</code>
	<orcid>1003194753284600586</orcid>
	<coreauthor>Yes
</coreauthor>
	<affiliation></affiliation>
	<affiliation_fa></affiliation_fa>
	 </author>


	<author>
	<first_name></first_name>
	<middle_name></middle_name>
	<last_name></last_name>
	<suffix></suffix>
	<first_name_fa> محمد تقی </first_name_fa>
	<middle_name_fa></middle_name_fa>
	<last_name_fa>دستورانی</last_name_fa>
	<suffix_fa></suffix_fa>
	<email></email>
	<code>1003194753284600587</code>
	<orcid>1003194753284600587</orcid>
	<coreauthor>No</coreauthor>
	<affiliation></affiliation>
	<affiliation_fa></affiliation_fa>
	 </author>


	<author>
	<first_name></first_name>
	<middle_name></middle_name>
	<last_name></last_name>
	<suffix></suffix>
	<first_name_fa>محمدرضا </first_name_fa>
	<middle_name_fa></middle_name_fa>
	<last_name_fa>اختصاصی</last_name_fa>
	<suffix_fa></suffix_fa>
	<email></email>
	<code>1003194753284600588</code>
	<orcid>1003194753284600588</orcid>
	<coreauthor>No</coreauthor>
	<affiliation></affiliation>
	<affiliation_fa></affiliation_fa>
	 </author>


	<author>
	<first_name></first_name>
	<middle_name></middle_name>
	<last_name></last_name>
	<suffix></suffix>
	<first_name_fa>حمیده </first_name_fa>
	<middle_name_fa></middle_name_fa>
	<last_name_fa>افخمی</last_name_fa>
	<suffix_fa></suffix_fa>
	<email></email>
	<code>1003194753284600589</code>
	<orcid>1003194753284600589</orcid>
	<coreauthor>No</coreauthor>
	<affiliation></affiliation>
	<affiliation_fa></affiliation_fa>
	 </author>


</author_list>


	</article>
</articleset>
</journal>
