(Case Analysis: Northwest Airlines and the Detroit Snowstorm 1. What exactly went wrong? How bad was this situation? Ans: There was a snowstorm on Saturday‚ January 2nd‚ which was very serious and caused over 10 inches of snowfall. Northwest Airlines had been too late to halt the departure of their planes from other cities to Detroit‚ on of its largest hub. They made the decision to let 30 planes land in Detroit on Sunday‚ neglecting those 14 inches of snow and the severe weather condition
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Regular Expressions This ppt is the work by Dr. Costas Busch‚ used with permission‚ and available from http://csc.lsu.edu/~busch/courses/theorycomp/fall2008/ 1 Regular Expressions Regular expressions describe regular languages Example: (a b c) * describes the language a‚ bc * ‚ a‚ bc‚ aa‚ abc‚ bca‚... 2 Recursive Definition Primitive regular expressions: ‚ ‚ Given regular expressionsr1 r2 and r1 r2 r1 r2 r1 * Are regular expressions r1 3 Examples A regular expression:
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CS 3133 Foundations of Computer Science C term 2014 Solutions of the Sample Problems for the Midterm Exam 1. Give a regular expression that represents the set of strings over Σ = {a‚ b} that contain the substring ab and the substring ba. Solution: a+ b+ a(a ∪ b)∗ ∪ b+ a+ b(a ∪ b)∗ (20 points) 2. Consider the following grammar G: S → SAB|λ A → aA|a B → bB|λ (a) Give a leftmost derivation of abbaab. (b) Build the derivation tree for the derivation in part (1). (c) What is L(G)? Solution:
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What are the benefits of regular exercise? The benefits of regular exercise are a controversial topic. While some exercise for superficial reasons‚ the reality is regular exercise is vital. Some of the benefits are: a healthy heart‚ lower risk of brain stroke‚ and reduce the obesity rate in our country. Daily exercise decreases the risk of having a premature heart attack. For instance‚ one who exercises routinely often lowers his or her heart rate. In addition‚ the blood pressure and cholesterol
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realize that regular exercise on people’s lives have numerous benefits.Regular exercise is a scientific exercise methods that people according to their physical condition according to certain rules of physical exercise.This essay will explain that regular physical exercise essential part of the school curriculum.It brings huge benefits both of body and soul. First‚ regular physical exercise is good for the body recognized by everyone.It can help you increase your body stronger‚ reduce your probability
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12-2-10 Essay A Regular Day of School Around six o’clock in the morning my alarm goes off. I wake up‚ take a shower‚ brush my teeth‚ and use the next half an hour packing my bag for the long day ahead. I usually bring two bags to school‚ one for my books in class‚ and another for after school because I usually have football practice at the end of my day. Seven o’clock I hear two loud beeps outside my house‚ and on time is my girlfriend Natasha. She was always on time because school started at
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Coloring Your Flowers Introduction This experiment will show us how the flowers change colors when ink food is added to the water. Reading about this process we discover how the roots and stems absorb the colored water. This experiment demonstrates how the water is absorbed into the plant and how the petals of the flower change color as a result. The process demonstrates how the plants draw the water up through the stem. The water reaches and hydrates the leaves first‚ and then the petals. This colored
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Sports Classes Shouldn’t Be Cancelled in High School There is a point that sports classes in high school take up too much time which should have been devoted in study and are better to be cancelled. In my opinion，however‚ those sports classes are so useful and significant that must exist all the time. Above all‚ exercise are meaningful for those students to keep healthy. Playing sports may enable them to gain more energy and vigor‚ which in turn improves their studying efficiency. Now that they
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extension to the school day will bring no benefits to students or staff. If an extra hour and a half get added to the school day there will be no other time for extracurricular activities. Sports‚ clubs‚ and meetings will be very hard to attend because there will hardly be any time. Also there is so much stress put onto students and staff already‚ so if even more time gets tacked onto the school day the staff and students will be very fatigued. Most people think the school day is long enough as
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The Heidi Game or Heidi Bowl was an American football game played on November 17‚ 1968. The home team‚ the Oakland Raiders‚ defeated the New York Jets‚ 43–32. The game is remembered for its exciting finish‚ as Oakland scored two touchdowns in the final minute to overcome a 32–29 New York lead. It came to be known as the Heidi Game because the National Broadcasting Company (NBC) controversially broke away from the game with the Jets still winning to air the television film Heidi at 7 p.m. in the Eastern
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