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9. List the name and initials of all trainers who ever had their own manager as a student in a general course (category GEN). Solution 8-9. SQL> 2 3 4 5 6 7 8 9 10 11 select from , , , where and and and and and distinct e.ename, e.init employees e courses c offerings o registrations r e.empno = o.trainer e.mgr = r.attendee c.code = o.course o.course = r.course o.begindate = r.begindate c.category = 'GEN';

Don t fret though! Computer Vision, like AI, is all about trimming down on the amount of computation at the right places. Tweaking parameters so they are optimized to your exact use cases is also immensely helpful. Done carefully, your program will be orders of magnitude faster with a small loss or even a gain in reliability. You can easily get more than 10x performance improvement with the following tweaks: Reduce the resolution of the input image. You won t need a 1600 1200 image to find faces, and most photos are blurry anyway, wasting pixels. 400 300 will do the trick just fine and give your app 16x less data to process. Just use a smaller IplImage in the iplImageFromUIImage:image method:

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ENAME INIT -------- ----SMITH N SQL> 10. Did we ever use two classrooms at the same time in the same course location Solution 8-10. SQL> select o1.location 2 , o1.begindate, o1.course, c1.duration 3 , o2.begindate, o2.course

As easy as it is to take Robosapien apart, you will still end up with a lot of loose pieces and screws. And not all of the screws or pieces are the same size. Not knowing which screw goes where will not only make reassembly a nightmare, but in some cases, the robot will not go back together properly or some of its functionality may suffer.

... CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB(); IplImage *iplImage = cvCreateImage(cvSize(image.size.width/4,image.size.height/4), IPL_DEPTH_8U, 4); // Use the IplImage as a bitmap context. ...

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Read the OpenCV documentation to learn how to tweak parameters in cvHarrDetectObjects(). As an example, the following settings are much faster and still work reasonably well when people are up close:

Here s an easy way to keep track of things: after you have removed a piece of Robosapien s shell, use that piece of shell as a container to hold all of the screws (see Figure 13-3). Another suggestion that works great, especially for larger pieces, is to use Robosapien s own accessory cup (see Figure 13-4). Those weekly pill boxes that have seven compartments and that are designed to keep track of which pills you are supposed to take on a particular day also work reasonably well, and have the advantage of having a lid for each compartment. Figure 13-3. You can use pieces of Robosapien s shell to hold the smaller pieces and screws for that particular component. This shot shows part of Robosapien s foot assembly holding the screws and the touch-sensor pieces.

from offerings o1 , offerings o2 , courses c1 where o1.location = o2.location and (o1.begindate < o2.begindate or o1.course <> o2.course ) and o1.course = c1.code and o2.begindate between o1.begindate and o1.begindate + c1.duration;

cvHaarDetectObjects(iplImage, haarCascade, cvStorage, 1.2, // scale_factor 2, CV_HAAR_DO_CANNY_PRUNING, cvSize(50, 50)); // min_neighbors

LOCATION BEGINDATE COUR DURATION BEGINDATE COURSE -------- ----------- ---- -------- ----------- -----DALLAS 01-FEB-2000 JAV 4 03-FEB-2000 XML SQL> The solution searches for two different course offerings (see lines 8 and 9) at the same location (see line 7) overlapping each other (see lines 11 and 12). Apparently, the Java course starting February 1, 2000, in Dallas overlaps with the XML course starting two days later (note that the Java course takes four days). 11. Produce a matrix report (one column per department, one row for each job) where each cell shows the number of employees for a specific department and a specific job. In a single SQL statement, it is impossible to dynamically derive the number of columns needed, so you may assume you have three departments only: 10, 20, and 30. Solution 8-11. SQL> 2 3 4 5 6 7 8 9 10 11 12 13 14 job count(case when deptno <> 10 then null else deptno end ) as dept_10 , sum(case deptno when 20 then 1 else 0 end ) as dept_20 , sum(decode(deptno,30,1,0)) as dept_30 from employees group by job; select ,

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