May/June 2010  (31)Scenario 2<br />Blake Walsh<br />
Scenario<br />The Niagara Drug Company is a large pharmaceutical company which develops, manufactures and markets new drug...
Question 4 (a) <br />They are developing an expert system to help chemists in their research.<br />Once a new drug is deve...
Answer<br />Any two points covering either design or installation from:<br />- knowledge engineer collects information fro...
Answer<br />- develop a suitable user interface with validation rules<br />- design the questions for a user<br />- create...
Question 4 (b) <br />They are developing an expert system to help chemists in their research.<br />Once a new drug is deve...
Answer<br />Any three from:<br />- using built in text editor of the system<br />- system adds new facts automatically to ...
Comments<br />This question is leads on from IGCSE ICT and candidates really should be familiar with the concept of settin...
Question 5<br />They have a market research team who use primary research techniques.<br />Describe the primary market res...
Answer<br />Any five points from:<br />1 mark for identifying method, 1 for expansion<br />- CAPI (computer assisted perso...
Answer<br />- CAWI (computer aided web interviewing)<br />- database of people willing to take part in research<br />- cus...
Comments<br />This proved a popular question and many Centres had taught these terms and their candidates scored well.<br />
Question 6<br />The diagram below shows one of Niagara Drug’s chemical processes. This process is dependent on pH and temp...
Answer<br />Any five points from:<br />- pH sensor and/or temperature sensor send signal to microprocessor<br />- signal c...
Answer<br />- system continually monitors pH and temperature<br />- if temperature is in correct range then do nothing/sig...
Comments<br />Candidates should be used to control questions from IGCSE ICT. It was worrying how few candidates understood...
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May June 2010 question/answer paper

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contains scenario 2 from a 2010 question paper for information systems may/june

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May June 2010 question/answer paper

  1. 1. May/June 2010 (31)Scenario 2<br />Blake Walsh<br />
  2. 2. Scenario<br />The Niagara Drug Company is a large pharmaceutical company which develops, manufactures and markets new drugs.<br />They are developing an expert system to help chemists in their research.<br />Once a new drug is developed, the company needs to market it. They have a market research team who use primary research techniques.<br />The company’s many processes are monitored and controlled by microprocessors.<br />
  3. 3. Question 4 (a) <br />They are developing an expert system to help chemists in their research.<br />Once a new drug is developed, the company needs to market it. They have a market research team who use primary research techniques.<br />Describe how the knowledge base of the expert system could be set up. [2]<br />
  4. 4. Answer<br />Any two points covering either design or installation from:<br />- knowledge engineer collects information from experts and from other systems (needs at<br />least two sources)<br />- a reference to data mining<br />- a knowledge base is designed<br />- implement forward chaining in system<br />- a rules base is designed to be used by the inference engine<br />
  5. 5. Answer<br />- develop a suitable user interface with validation rules<br />- design the questions for a user<br />- create an explanation system for output<br />- system would be checked using data with known outcomes<br />- production of user manuals/training of staff in E/S use<br />- a test plan designed with known answers from experts<br />- an implementation plan set up<br />
  6. 6. Question 4 (b) <br />They are developing an expert system to help chemists in their research.<br />Once a new drug is developed, the company needs to market it. They have a market research team who use primary research techniques.<br />Explain how the knowledge base of the expert system will be edited. [3]<br />
  7. 7. Answer<br />Any three from:<br />- using built in text editor of the system<br />- system adds new facts automatically to database<br />- from company server<br />- remote access to knowledge base and amended<br />- by research staff<br />- using text editor directly on knowledge base<br />
  8. 8. Comments<br />This question is leads on from IGCSE ICT and candidates really should be familiar with the concept of setting up a knowledge based expert system. <br />They were required to provide more specific answers than at IGCSE and many failed.<br />It was good to see some candidates reaching an A2 standard.<br />(a) Design and installation only to earn marks<br />(b) Very few answers showed understanding of the need for an editor to update a knowledge base.<br />
  9. 9. Question 5<br />They have a market research team who use primary research techniques.<br />Describe the primary market research techniques that would be used. [5]<br />
  10. 10. Answer<br />Any five points from:<br />1 mark for identifying method, 1 for expansion<br />- CAPI (computer assisted personal interviewing)<br />- sit in front of computer and answer on screen questions<br />- interviewer asks questions prompted by computer<br />- CATI (computer assisted telephone interviewing)<br />- basically call centres used in this technique<br />- computer dials phone numbers of target audience and then interview takes place using script<br />
  11. 11. Answer<br />- CAWI (computer aided web interviewing)<br />- database of people willing to take part in research<br />- customer logs on to web site and answers questions<br />- use pop ups/adverts on selected web sites<br />- Use of person-person interviews and techniques<br />
  12. 12. Comments<br />This proved a popular question and many Centres had taught these terms and their candidates scored well.<br />
  13. 13. Question 6<br />The diagram below shows one of Niagara Drug’s chemical processes. This process is dependent on pH and temperature. Sensors are used to relay back information.<br />Describe how the sensors and microprocessor are used to control the conditions in the chemical process. [5]<br />
  14. 14. Answer<br />Any five points from:<br />- pH sensor and/or temperature sensor send signal to microprocessor<br />- signal converted to digital by ADC if signal is analogue<br />- microprocessor compares input values …<br />…against previously stored range<br />- if pH too low, sends signal to actuator to open valve and add acid<br />- if ph in range then do nothing/signal sent to close valve<br />- if temperature too low, sends signal to actuator to turn on heater<br />
  15. 15. Answer<br />- system continually monitors pH and temperature<br />- if temperature is in correct range then do nothing/signal sent to actuator to turn heater off<br />- microprocessor sends signals to control room displays to allow operators to monitor conditions<br />- microprocessor can send signals to warn operators of malfunction<br />- sensors also on heater and acid feed …<br />- …to warn of (local) malfunction e.g. out of acid/heater not working<br />
  16. 16. Comments<br />Candidates should be used to control questions from IGCSE ICT. It was worrying how few candidates understood the concept of an acceptable range rather than a specific reference value. <br />The use of ADC was good but few understood the use of actuators.<br />Centres need to ensure that the candidates understand that a sensor does not decide what to do it, simply inputs data into a microprocessor via an ADC.<br />

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