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تجزیه وتحلیل سیستم - سیستم ونگرش سیستمی چیست؟
تجزیه وتحلیل سیستم

سلام خوش آمدید

سیستم ونگرش سیستمی چیست؟

پنجشنبه 9 تیر 1390

سیستم مجموعه‌ای است از اجزای به هم وابسته

که به علت وابستگی حاکم بر اجزای خود کلیت

جدیدی را احراز کرده از نظم و سازمان خاصی

می‌نماید و در جهت تحقق هدف معینی که دلیل

وجودی آن است فعالیت میکند

سیستم‌ها بی‌شمار هستند. برخی از نمونه‌های

سیتم عبارت است از:

ملکولها؛ سلولها؛ نباتات؛ حیوانات؛ انسانها؛ جوامع؛ ماشینها و دیگر نظامهای مکانیکی؛ منظومه‌های کیهانی؛ نظامهای اجتماعی، سیاسی، اقتصادی و فرهنگی؛ سیستم اطلاعات؛ کامپیوتر؛ نظامهای تولیدی، آموزشی، تامین اجتماعی، خدمات درمانی، ارتباط جمعی، حسابداری، بایگانی، نظام حقوق و دستمزد، باز نشستگی، ارزشیابی کارکنان و کنترل؛ خطی که با آن می‌نویسیم زبانی که با آن تکلم می کنیم و.......در این مقاله، مفاهیم نظام و سیستم، مترادف گرفته شده اند.

درونداد

درونداد‌ها یا داده‌ها عبارت‌اند از:کلیه آنچه که به‌نحوی وارد سیستم می‌شود و تحرک و فعایت سیستم را سبب میگردد.
فرایند تبدیل (میانداد)
دروندادی که به سیستم وارد می‌شود، طبق برنامه  سیستم، در جریان تغییر و تبدیل قرار می گیرد.

مثال: در نظام دانشگاهی، دانشجو که یکی از داده‌های سیستم است، در فرآیند تبدیل قرار می‌گیرد و ذهن او با مفاهیم، واژه‌ها و مطالب علمی آشنا می‌شود و در نگرش او تغییراتی پدید می آید.

برونداد:

داده‌هایی که در فرآیند تیدیل قرار می گیرند، طبق نظم و سازمانی که بر سیستم حاکم است، به صورت کالا یا خدمت، از سیستم به محیط صادر می شوند. دانشجوی فارغ التحصیل، تحقیق و پژوهش، برخی از ستاده‌های نظام دانشگاهی هستند.

بازخور(باز داد)

بازخور فرآیندی دورانی هستند که در آن، قسمتی از ستاده، به عنوان اطلاعات به درونداد پس خورانده می‌شوند و به این ترتیب سیستم را «خود کنترل» می‌سازد.
برای مثال، چنانچه به علت عدم تطا‌بق آموزشهای دانشگاهی با نیاز‌های واقعی بازار کار، دانشجوی فارغ التحصیل نتواند جذب بازار کار شود، ایجاد اصلاحاتی در نظام آموزشی دانشگاه ضرورت دارد.

سیستم‌های اصلی و فرعی
سیستم ها به دو دسته اصلی و فرعی تقسیم شده‌اند: سیستم فرعی جزعی است که برخود نظارت دارد و وظیفه خاصی را انجام می‌دهد و برای رسیدن به هدف معینی می‌کوشد؛ این سیستم فرعی که نقش ویژه ای ایفا می‌کند، خود یکی از اجزای تشکیل دهنده سیستم بزرگتری است که میتوان آن را «سیستم اصلی»نام نهاد.

تقسیم سیستم ها به باز و بسته، یکی دیگر از طبقه بندیهای سیستم‌ها است. سیستم بسته، سیستمی ساده است که با محیط خود ارتباطی برقرار نمی‌کند یعنی داده های آن به صورت پایان نا پذیر در حال چرخش است مثل سیستم گردش آب؛ بر خلاف آن سیستم باز، سیستمی است که با محیط خود در ارتباط است یعنی چیزی را می گیرد در فر آیند تغییر و تبدیل قرار می دهد و بعد به محیط باز می گرداند. سیستم‌های بسته در برخورد با محیط، سازمان خود را از دست می‌هد یا جهت فعالیتش تغییر می‌کند.

در هر سیستم، عواملی وجود دارند که در خلاف جهت نظم سیستم عمل می‌کنند و مختل کننده‌ی انتظام سیستم هستند. این عوامل را «آنتروپی» می‌خوانند.آنتروپی به دو نوع تقسیم می‌شود: آنتروپی مثبت که عملگردش در خلاف جهت اصلاح انحرافات و به منظور بقای سیستم در محیط عمل می‌کند.

خواص سیستم باز

1-    کلیت و جامعیت وجودی

سیستم در کلیت وجودی خود خواصی را ظاهر می‌سازد که در اجزای تشکیل دهندﮤ آن، به تنهایی وجود ندارد، این کلیت نیز نتیجه گرد آمدن اجزاء مجرد نیست، بلکه ارتباط اجزاء با یکدیگر و نحوه ترکیب نظم و سازمان یافتن آنهاست که کلیت سیستم را به وجود می‌آورد.

2-سلسله مراتب

مراتب وجود یک زنجیره مرتبه ای است که هر یک از مرتبه‌ها، ساخت و خواصی علاوه بر ویژگی های مرتبه پیشین دارد.

3-همبستگی اجزاء

منظور از همبستگی این است که هر جزء در سیستم، به نحوی با سایر اجزاء مرتبط است و به علت وجود این همبستگی، چنانچه در جزیی خللی وارد شود،سایر اجزاء نیز از آن خلل، متاثرمی گردند.

4-تناسب اجزاء

بین اجزای هر سیستم، تناسب، سنخیت واکمال متقابل موجود است. وجود تناسب بین اجزاء سبب حفظ هویت و کلیت سیستم می‌شود.

5-گردش دایره وار

فرآیند درونداد، تبدیل و برونداد، جریانی مستمر و مداوم است.

6-خاصیت تولید مثل

از دیگر ویژگی‌های سیستم های باز، میل به جاودانگی است. سیستم‌ها گرایش به جاودانه سازی خود دارند و تا جایی که امکان داشته باشد به حیات خویش ادامه می‌دهند.

7-همپایانی

سیستم می‌تواند از راه‌ها و مسیر‌های متفاوتی به هدف واحدی برسد. به عبارت دیگر، حالت پایانی واحدی ممکن است از شرایط اولیه متفاوت و با راههای متفاوتی حاصل شود.

8-گرایش به فنا

درون سیستم‌ها عواملی به وجود می‌آیند که سیستم را از جهت اصلی آن منحرف می‌سازند و تمایل در جهت عدم تعادل دارند.

9-گرایش به تکامل

منظور از تکامل، عبارت از پیچیدگی ساخت وتنوع خواص است. چنانچه ساختار سیستم، پیچیده‌تر شود و در اثر آن پیچیدگی، عملکرد‌های متنوعتری از سیستم به ظهور رسد و خواص بیشتری ارائه شود، سیستم متکامل تر شده است.

10-گرایش به تکامل یا خود نکهداری پویا

از دیگر ویژگی‌های سیستمهای باز، خصوصیت تعادل گرایی یا خود نگهداری پویا و حالت پا بر جایی است.

منظور از این حالت که به «هوموستاسیس» معروف است، تلاش سیستم در حفظ متغییر‌های ضروری خود، در محدوده‌ای معین به منظور ادامه حیات سیستم می‌باشد.


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