دوره 15، شماره 4 - ( 12-1397 )
جلد 15 شماره 4 صفحات 84-71 |
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paksima J. A novel model for phrase searching based-on Minimum Weighted Relocation Model. JSDP 2019; 15 (4) :71-84
URL: http://jsdp.rcisp.ac.ir/article-1-670-fa.html
URL: http://jsdp.rcisp.ac.ir/article-1-670-fa.html
پاک سیما جواد. مدل جدیدی برای جستجوی عبارت بر اساس کمینه جابهجایی وزن‌دار. پردازش علائم و داده‌ها. 1397; 15 (4) :71-84
دانشگاه پیام‌نور یزد
چکیده: (3346 مشاهده)
بر اساس پژوهشهای انجام‌شده روی موتورهای جستجو، بیشتر پرس‌وجوهای کاربران بیش از یک واژه است. برای پرس‌وجوهای با بیش از یک واژه دو مدل می‌توان ارائه داد. در مدل نخست فرض می‌شود واژگان پرس‌وجو مستقل از یکدیگر هستند و در مدل دوم محل و ترتیب واژگان وابسته فرض می‌شود. آزمایش‌ها نشان می‌دهد که در بیشتر پرس‌وجوها بین واژگان وابستگی وجود دارد. یکی از پارامترهایی که می‌تواند وابستگی بین واژگان پرس‌وجو را مشخص کند، فاصلۀ بین واژگان پرس‌وجو در سند است. در این مقاله تعریف جدیدی از فاصله بر اساس کمینه جابهجایی وزن‌دار[1] واژگان سند بهمنظور تطبیق بر پرس‌وجو ارائه می‌شود. همچنین با توجه به این‌که بیشتر الگوریتم‌های رتبه‌بندی از فرکانس رخداد یک واژه در سند[2] برای امتیاز‌دهی به اسناد استفاده می‌کنند و برای پرس‌وجو با بیش از یک واژه تعریف روشنی از این پارامتر وجود ندارد. در این مقاله پارامترهای فرکانس رخداد یک عبارت[3] و معکوس فرکانس سند[4] با توجه به مفهوم جدید فاصله تعریف‌شده و الگوریتم‌هایی برای محاسبه آن‌ها ارائه شده است. همچنین نتایج الگوریتم پیشنهادی با چند الگوریتم مقایسه شده است که افزایش خوبی را در میانگین دقّت نشان می‌دهد.
نوع مطالعه: بنیادی |
موضوع مقاله:
مقالات پردازش متن
دریافت: 1396/8/25 | پذیرش: 1397/10/19 | انتشار: 1397/12/17 | انتشار الکترونیک: 1397/12/17
دریافت: 1396/8/25 | پذیرش: 1397/10/19 | انتشار: 1397/12/17 | انتشار الکترونیک: 1397/12/17
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