شناسائی انجمن در شبکه های دوبخشی با استفاده از معیار مرکزیت هلرنک
الموضوعات :علی خسروزاده 1 , علی موقر 2 , محمدمهدی گیلانیان صادقی 3 , حمیدرضا ماهیار 4
1 - گروه مهندسی کامپیوتر، واحد قزوین، دانشگاه آزاد اسلامی، قزوین، ایران
2 - گروه مهندسی کامپیوتر، دانشگاه صنعتی شریف، تهران، ایران
3 - گروه مهندسی کامپیوتر، واحد قزوین، دانشگاه آزاد اسلامی، قزوین، ایران
4 - گروه مهندسی کامپیوتر، دانشگاه مک مستر، همیلتون، انتاریو، کانادا
الکلمات المفتاحية: شبکه های اجتماعی, گراف های دوبخشی, معیار مرکزیت, شناسائی انجمن, رای گیری,
ملخص المقالة :
ساختار انجمن ویژگی مشترک و مهمی در بسیاری از شبکه های پیچیده از جمله شبکه های دوبخشی است. شناسائی انجمن ها در سال‌های اخیر در بسیاری زمینه‌ها مورد توجه قرار گرفته و روش‌های زیادی برای این منظور پیشنهاد شده است، اما مصرف سنگین زمان در برخی روش ها، استفاده از آنها را در شبکه‌های بزرگ مقیاس محدود می‌کند. روش‌هائی با پیچیدگی کمتر وجود دارند اما اکثراً غیرقطعی هستند که کاربرد آنها در دنیای واقعی را کاهش می‌دهد. رویکرد معمول اتخاذ شده برای شناسائی انجمن ها در شبکه‌های دوبخشی این است که ابتدا یک طرح ریزی یک‌بخشی از شبکه ساخته شود و سپس انجمن ها در آن طرح ریزی با استفاده از روش‌های مربوط به شبکه‌های یک‌بخشی شناسائی شوند. این طرح ریزی ها به طور ذاتی اطلاعات را از دست می‌دهند. در این مقاله بر اساس معیار ماژولاریتی دوبخشی که قدرت تقسیم بندی ها را در شبکه های دوبخشی محاسبه می کند و با استفاده از معیار مرکزیت هلرنک، روشی سریع و قطعی برای شناسائی انجمن ها از شبکه های دوبخشی بطور مستقیم و بی نیاز از طرح ریزی ارائه گردیده است. روش پیشنهادی از فرآیند رأی گیری در فعالیت های انتخاباتی در جامعه اجتماعی الهام گرفته و آن را شبیه سازی می کند. نتایج آزمایشات نشان می دهد، مقدار ماژولاریتی انجمن های حاصل و دقت شناسائی تعداد آنها در روش پیشنهادی بهبود یافته است.
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