Data Warehousing and Data Mining Set 2

Data Warehousing and Data Mining 

Questions 11 to 21



Set 1

Set 2

Set 3
11. Data modeling technique used for data marts is
(a) Dimensional modeling
(b) ER – model
(c) Extended ER – model
(d) Physical model
(e) Logical model.

12. A warehouse architect is trying to determine what data must be included in the warehouse. A meeting has been arranged with a business analyst to understand the data requirements, which of the following should be included in the agenda?
(a) Number of users
(b) Corporate objectives
(c) Database design
(d) Routine reporting
(e) Budget.

13. An OLAP tool provides for
(a) Multidimensional analysis
(b) Roll-up and drill-down
(c) Slicing and dicing
(d) Rotation
(e) Setting up only relations.

14. The Synonym for data mining is
(a) Data warehouse
(b) Knowledge discovery in database
(c) ETL
(d) Business intelligence
(e) OLAP.

15. Which of the following statements is true?
(a) A fact table describes the transactions stored in a DWH
(b) A fact table describes the granularity of data held in a DWH
(c) The fact table of a data warehouse is the main store of descriptions of the transactions stored in a DWH
(d) The fact table of a data warehouse is the main store of all of the recorded transactions over time
(e) A fact table maintains the old records of the database.

16. Most common kind of queries in a data warehouse
(a) Inside-out queries
(b) Outside-in queries
(c) Browse queries
(d) Range queries
(e) All (a), (b), (c) and (d) above.

17. Concept description is the basic form of the
(a) Predictive data mining
(b) Descriptive data mining
(c) Data warehouse
(d) Relational data base
(e) Proactive data mining.

18. The apriori property means
(a) If a set cannot pass a test, all of its supersets will fail the same test as well
(b) To improve the efficiency the level-wise generation of frequent item sets
(c) If a set can pass a test, all of its supersets will fail the same test as well
(d) To decrease the efficiency the level-wise generation of frequent item sets
(e) All (a), (b), (c) and (d) above.

19. Which of following form the set of data created to support a specific short lived business situation?
(a) Personal data marts
(b) Application models
(c) Downstream systems
(d) Disposable data marts
(e) Data mining models.

20. What is/are the different types of Meta data?
I. Administrative.
II. Business.
III. Operational.
(a) Only (I) above
(b) Both (II) and (III) above
(c) Both (I) and (II) above
(d) Both (I) and (III) above
(e) All (I), (II) and (III) above.

Answers


      Ans                               Explanation

11. A Data modeling technique used for data marts is Dimensional modeling.

12. D Routine reporting should be included in the agenda.

13. C An OLAP tool provides for Slicing and dicing.

14. C The synonym for data mining is Knowledge discovery in Database.

15. D The fact table of a data warehouse is the main store of all of the recorded transactions over time is the correct statement.

16. A The Most common kind of queries in a data warehouse is Inside-out queries.

17. B Concept description is the basis form of the descriptive data mining.

18. B The apriori property means to improve the efficiency the level-wise generation of frequent item sets.

19. D Disposable Data Marts is the form the set of data created to support a specific short lived business situation.

20. E The different types of Meta data are Administrative, Business and Operational.



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  96. Nice Information...Thanks for Posting such a wonderful and useful information...
    Data science training in Pune

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  97. we did this today. saw it on pinterest. we had a bunch of pillows and couch cushions at the bottom for a soft landing. awesome!!!
    Click
    Click
    Click
    Click
    Click

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  98. مخزن پلی پروپیلن ظرفی برای ذخیره آب است.
    مخزن پلی پروپیلن برای استفاده در بسیاری از کاربردها، آب آشامیدنی ، کشاورزی آبیاری، مهار آتش ، کشاورزی کشاورزی ، هم برای گیاهان و هم برای دام، تولید مواد شیمیایی ، تهیه غذا و همچنین بسیاری از مصارف دیگر استفاده می شود. پارامترهای مخزن پلی پروپیلن شامل طراحی کلی مخزن و انتخاب مصالح ساختمانی، آستر می باشد. برای ساخت مخزن پلی پروپیلن از مواد مختلفی استفاده می شود: پلاستیک ( پلی اتیلن ، پلی پروپیلن )، فایبرگلاس ، بتن ، سنگ.، فولاد (جوش داده شده یا پیچ، [ نیازمند منبع ] کربن، یا ضد زنگ). از گلدان های سفالی مانند ماتکی که در جنوب آسیا استفاده می شود نیز می توان برای ذخیره آب استفاده کرد. مخازن آب روشی کارآمد برای کمک به کشورهای در حال توسعه برای ذخیره آب پاک هستند
    انواع
    مخزن پلی پروپیلن تماس شیمیایی از ساخت FDA و NSF پلی اتیلن ، زمان ماندگاری را برای مواد شیمیایی تصفیه شیمیایی برای "تماس" (تصفیه شیمیایی) با آب محصول امکان پذیر می کند.
    تاانکا در راجستان به عنوان یک شکل سنتی برداشت آب باران استفاده می شود
    مخزن پلی پروپیلن ، ساخته شده از فولاد کربنی اندود شده، ممکن است آب را از یک چاه آب یا از آب های سطحی دریافت کند، که اجازه می دهد حجم زیادی از آب در انبار قرار گیرد و در چرخه های اوج تقاضا مورد استفاده قرار گیرد.
    مخزن پلی پروپیلن مرتفع که به عنوان برج آب نیز شناخته می شود ، در خروجی سطح زمین فشاری معادل 1 کیلو پاسکال در هر 10.2 سانتی متر (4.0 اینچ) یا 1 psi در هر 2.31 فوت (0.70 متر) از ارتفاع ایجاد می کند. بنابراین یک مخزن پلی پروپیلن با ارتفاع 20 متر حدود 200 کیلو پاسکال و یک مخزن پلی پروپیلن با ارتفاع 70 فوت حدود 30 psi فشار تخلیه ایجاد می کند که برای اکثر نیازهای خانگی و صنعتی کافی است.
    مخازن بالای گنبد استوانه ای عمودی ممکن است از 200 لیتر یا پنجاه گالن تا چند میلیون گالن را در خود جای دهند. مخازن استوانه‌ای افقی معمولاً برای حمل و نقل استفاده می‌شوند، زیرا سطح پایین آنها مرکز ثقل پایینی ایجاد می‌کند که به حفظ تعادل برای وسیله نقلیه، تریلر یا کامیون کمک می‌کند.
    مخزن هیدروپنوماتیکی معمولاً یک مخزن پلی پروپیلن ذخیره افقی تحت فشار است. تحت فشار قرار دادن این مخزن آب باعث می شود که آب ذخیره شده به سیستم توزیع بدون جهش افزایش یابد.
    مخزن پلی پروپیلن در سئول، کره
    با طراحی یک مخزن پلی پروپیلن یا ظرف آب نباید هیچ آسیبی به آب وارد کند. آب در برابر تعدادی از تأثیرات منفی محیط، از جمله باکتری ها ، ویروس ها ، جلبک ها ، تغییرات pH ، تجمع مواد معدنی و گازهای انباشته شده حساس است . آلودگی می تواند منشاء مختلفی از جمله لوله کشی، مصالح ساختمانی مخزن پلی پروپیلن ، مدفوع حیوانات و پرندگان، مواد معدنی و نفوذ گاز داشته باشد. یک مخزن پلی پروپیلن به درستی طراحی شده برای مقابله و کاهش این اثرات منفی کار می کند.
    یک مقاله خبری مبتنی بر ایمنی، مسمومیت با مس را ناشی از یک مخزن پلی پروپیلن مرتبط دانست. این مقاله نشان داد که آب باران جمع آوری و در یک مخزن پلی پروپیلن می شود و این مخزن هیچ کاری برای کاهش pH پایین انجام نمی دهد. سپس آب با لوله‌های مسی وارد خانه‌ها می‌شد، مس توسط آب باران با اسید بالا آزاد می‌شد و باعث مسمومیت در انسان می‌شد. [ نیاز به منبع ] از آنجایی که مخزن پلی پروپیلن یک ظرف بی اثر است، هیچ تاثیری بر آب ورودی ندارد. عمل خوب این است که هر منبع آبی را به صورت دوره ای تجزیه و تحلیل کنید و بر اساس آن تصفیه شود، در این مورد، باران اسیدی جمع آوری شده باید تجزیه و تحلیل شود و قبل از وارد شدن به یک سیستم تامین آب خانگی را تنظیم کرد.
    انتشار مس در اثر آب اسیدی ممکن است با فناوری‌های مختلفی کنترل شود، که از نوارهای pH شروع می‌شود و به مانیتورهای pH پیچیده‌تر می‌رود، pH را نشان می‌دهد که اسیدی یا سوزاننده است، برخی با قابلیت‌های ارتباطی خروجی. بیشتر رشد جلبک ها در pH بهینه بین 8.2 تا 8.7 رخ می دهد. سطح pH خنثی یا پایین تر می تواند به کاهش رشد جلبک ها کمک کند. جلبک کش بالقوه ، محصول شوک به تمیز کردن استخرها یا مخازن آب از جلبک ها کمک می کند . در این فرآیند نیازی به استفاده از جاروبرقی برای حذف جلبک نیست.
    ❤️❤️❤️
    https://remote.misis.ru/eportfolios/679/%D0%92_%D0%BD%D0%B0%D1%87%D0%B0%D0%BB%D0%BE/%D9%85%D8%AE%D8%B2%D9%86_%D9%BE%D9%84%DB%8C_%D9%BE%D8%B1%D9%88%D9%BE%DB%8C%D9%84%D9%86

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  99. ❤️❤️❤️❤️❤️❤️
    انکوباتور یا تخم‌گذار، دستگاهی است که برای جوجه‌کشی تخم مرغ و سایر پرندگان به کار می‌رود. این دستگاه به صورت یک جعبه یا پوشش با دمای ثابت و رطوبت مطمئن طراحی شده است. درون این دستگاه، تخم‌های مرغ یا پرندگان دیگر در شرایطی مطابق با نیازهای بیولوژیکی خود، تحت تاثیر گرما و رطوبت قرار می‌گیرند تا جوجه‌هایی به دنیا بیایند.
    انکوباتورها معمولاً دارای تنظیم دما، رطوبت و تهویه مطبوع هستند. این امکان را به کاربر می‌دهند تا شرایط محیطی مطلوب برای جوجه‌کشی تخم مرغ یا سایر پرندگان را به راحتی ایجاد کند. همچنین، برخی انکوباتورها به دارایی سیستم پوشش درب و یا صفحه نمایش برای نمایش وضعیت داخلی دستگاه می‌باشند.
    انکوباتورها به دلیل کارایی بالا، مصرف انرژی کم و قابلیت حمل و نقل آسان، در صنایع مختلف مورد استفاده قرار می‌گیرند. این دستگاه‌ها در صنایع پرورش مرغ، جوجه‌کشی و پرورش سایر پرندگان نظیر بلدرچین، بوقلمون، شترمرغ و غیره استفاده می‌شوند. همچنین، انکوباتورها به دلیل قابلیت کنترل دقیق شرایط محیطی، به عنوان یکی از راه‌حل‌های مهم در پرورش پرندگان، به خصوص در مناطقی با شرایط آب و هوایی نامساعد، شناخته شده‌اند.
    ❤️❤️❤️❤️❤️❤️
    https://cinateb.com/incubator/

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  100. ❤️❤️❤️❤️❤️❤️
    هواساز یا air conditioner، یک دستگاه الکترومکانیکی است که برای مدیریت دمای هوا در داخل یک فضای بسته استفاده می‌شود. هواساز‌ها، در سیستم‌های تهویه مطبوع، خودروها، قطارها، هواپیماها و بسیاری از محیط‌های دیگر کاربرد دارند.
    در هواساز، هوای گرم و رطوبت دار از داخل محیط جذب می‌شود و به داخل دستگاه می‌رود. سپس، هوای گرم و رطوبت دار به وسیله یک کمپرسور فشرده می‌شود و به یک شوزن خنک‌کننده منتقل می‌شود. در این مرحله، هوا خنک شده و رطوبت آن می‌کاهد. سپس، هوای خنک شده به داخل فضای بسته بازمی‌گردد و دمای آن را کاهش می‌دهد.
    هواساز‌ها به دلیل مزایایی مانند کارایی بالا، کنترل دما و رطوبت، سلامتی و راحتی کاربران، کاهش هزینه‌های انرژی و حفظ محیط زیست، در سیستم‌های تهویه مطبوع، خودروها، قطارها، هواپیماها و بسیاری از محیط‌های دیگر کاربرد دارند.
    به علاوه، هواساز‌ها به دلیل توانایی کنترل دما و رطوبت، می‌توانند به عنوان یک راه حل برای مشکلات حرارتی و رطوبتی در محیط‌های صنعتی و تجاری استفاده شوند. همچنین، در شهرهای گرمسیری با افزایش دمای هوا، هواساز‌ها به عنوان یکی از راه‌حل‌هایی که می‌توانند به کاهش اثرات گرمایش جهانی کمک کنند، مورد استفاده قرار می‌گیرند.
    ❤️❤️❤️❤️❤️❤️
    https://cooling-tower.ir/%D9%87%D9%88%D8%A7%D8%B3%D8%A7%D8%B2/

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  101. ❤️❤️❤️❤️❤️❤️
    لوله‌های فولادی، لوله‌هایی هستند که از جنس فولاد ساخته می‌شوند و در بسیاری از صنایع مورد استفاده قرار می‌گیرند. این نوع لوله‌ها به دلیل مقاومت بالا و قابلیت انعطاف در برابر فشار، حرارت و خوردگی، برای انتقال مواد و سیالات مختلف مورد استفاده قرار می‌گیرند.
    لوله‌های فولادی معمولاً به صورت مفتولی، جوش دار یا بدون درز تولید می‌شوند. این لوله‌ها در اندازه‌ها و قطرهای مختلف و با ضخامت‌های متنوعی تولید می‌شوند، بسته به نیاز و کاربردهای مختلف.
    از جمله کاربردهای اصلی لوله‌های فولادی می‌توان به انتقال آب، گاز، نفت، پتروشیمی، صنایع ساختمانی و تاسیساتی، انتقال سیالات در صنایع مختلف، تولید انرژی، و حتی در صنایع خودروسازی اشاره کرد.
    ترکیب مقاومت و انعطاف‌پذیری لوله‌های فولادی، آن‌ها را به یکی از انتخاب‌های محبوب برای استفاده در پروژه‌های صنعتی و ساختمانی تبدیل کرده است.
    ❤️❤️❤️❤️❤️❤️
    https://pipe-iran.ir/2019/11/24/%d9%84%d9%88%d9%84%d9%87-%d9%81%d9%88%d9%84%d8%a7%d8%af%db%8c/

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