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Medium 9780596517960

3. The Patent System

Slice ePub May 27, 2014

One of the first assignments frequently given to new programming students is the Fibonacci function: given a number n, return the nth number in the Fibonacci sequence. A typical response to this assignment might be coded as follows:

Unfortunately, this code has a trick: trying to compute fib(n) any numbers larger than 40 or so results in incredibly long running times. In algorithmic terms, this code has complexity O(2n). In other words, the running time increases exponentially as the number requested goes up. Before n gets very large, the running time is too long to be feasible.

The reason why the fib function is so expensive is because it redoes the work each time. If you ask for fib(5), the function also works out fib(4) and fib(3). The calculation of fib(4) in turn works out fib(3) and fib(2). The calculation of fib(3) works out fib(2) and fib(1), etc. There is a lot of duplicated effort, and that duplicated effort takes work and time.

One technique for speeding up this function is memoization. Memoization works by caching the results of each call in a lookup table. The first time a function is called with certain arguments, the memoized function computes the result and associates the function arguments with the result value. When the function is called later with the same arguments, the memoized function returns the cached value rather than spending time and processing power computing the results again.

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Medium 9781783103850

2. Painting, Mosaics, and Illuminations

Source: Byzantine Art
Slice ePub February 10, 2015

 

 

In a large number of churches from the sixth and seventh centuries, such as the Hagia Sophia, mosaics pour out the wealth of their adornments and are displayed as brilliant works. Byzantine artists loved to depict huge compositions whose details were all distinct; they avoided subjects that involved a large number of figures mingled with one another; they gave preference to those with almost no action, the postures calm and regular, in which the characters could be arranged without at all disturbing the uniformed arrangement of the ensemble. At times they would place the same number on one side as on the other, so as not to disturb the compositional equilibrium. This principle of symmetry had to be maintained in Byzantine art. The painters’ mentality was so imbued with it that it was applied assiduously, even in the smallest works. For this reason this art, even while losing at times something on the side of authenticity and artistic freedom, was so well suited for the decoration of huge structures.

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Medium 9781571205384

Stacked and Layered

Slice PDF October 05, 2013

Wall/Crib: 40½˝ × 54½˝

Twin: 66½˝ × 80½˝

Queen: 88½˝ × 100½˝

materials

Yardages are based on 42˝-wide fabric.

Fabric

Wall/Crib

Twin

Queen

Fabric #1

⅞ yard

2 yards

2⅝ yards

Fabric #2

¾ yard

2 yards

2 yards

Fabric #3

1⅛ yards

2 yards

2⅝ yards

Fabric #4

1 yard

1¾ yards

2½ yards

Fabric #5

1 yard

1½ yards

2⅛ yards

Backing

46˝ × 60˝ (Use leftovers and supplement as necessary.)

72˝ × 86˝ (Use leftovers and supplement as necessary.)

94˝ × 106˝ (Use leftovers and supplement as necessary.)

Binding

Leftovers* or ½ yard

Leftovers* or ¾ yard

Leftovers* or ⅞ yard

Batting

46˝ × 60˝

72˝ × 86˝

94˝ × 106˝

* There will be enough left over to create a multifabric binding.

cutting

Write the fabric number on masking tape and attach it to each piece.

Wall/Crib

Fabric

#1

Number of Strips*

Twin

Size of Pieces

Number of

Pieces

Number of Strips*

Queen

Size of Pieces

Number of

Pieces

Number of Strips*

Size of Pieces

Number of

Pieces

2

4½˝ × 24½˝

2

2

6½˝ × 36½˝

2

3**

8½˝ × 48½˝

2

2

4½˝ × 32½˝

2

3**

6½˝ × 48½˝

2

4**

8½˝ × 64½˝

2

#2

1

8½˝ × 12½˝

1

1

12½˝ × 18½˝

1

1

16½˝ × 24½˝

1

2

4½˝ × 24½˝

2

2

6½˝ × 36½˝

2

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Medium 9780596559595

Micro-Messaging for Internal Communications

Slice PDF May 27, 2014

Micro-Messaging for Internal

Communications

Micro-messaging started out primarily as a way for people to share tiny status updates about themselves, which isn’t a class of information traditionally traded at work. But as people found ambient awareness very powerful in their personal lives, they started to look for similar connections in their professional lives.

Zappos CEO Tony Hsieh had been using Twitter for about a year with a group of friends when he decided to introduce it to his company in the spring of 2008. Today, about 460 Zappos employees use Twitter (approximately a quarter of its workforce). The company lists them on a public website: http://twitter.zappos.com/employees; and it aggregates their posts to Twitter: http://twitter. zappos.com/employee_tweets. It even offers classes to help employees get started with the service.

Hsieh has been a prominent proponent of Twitter, widely covered by the media, and interviewers usually assume Zappos was drawn to Twitter primarily for marketing purposes. But Hsieh says that’s not a motivating factor, and his marketing department wasn’t in on his plan to encourage employees to Twitter. Instead, he was interested in the internal connections it could support. “It helps us build our culture, and it makes working together better,” he says. “Trust is higher. Communication is better.” Employees are more aware of each other inside and outside work, he adds.

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Medium 9781855758513

CHAPTER THIRTEEN: Bulimia, anxiety, and the demand of the Other

Slice ePub May 23, 2014

Maria-Cristina Aguirre

The purpose of this paper is to interrogate the connection between bulimia and anxiety. Through several short clinical vignettes, we will examine the connection between anxiety and the demand of the Other.

Andrea is as beautiful as she is thin; she is brilliant but her life is a mess. She defines herself as different, radically different. The first time she saw me she told me, “I’m not like you.” How can she know what I’m like at first glance? She has other needs, she says, she cannot keep in place; she has to move constantly, but it is always too late. What she wants is what was there before, if only she had made a decision other than the one that she did. She is constantly regretting what could have been. It is easy here to perceive the signs of the hysteric’s desire. Maybe. Andrea is not my patient. I met her briefly through a friend of her family who is trying to help her get her act together and get treatment. As Andrea is incapable of keeping appointments, they are looking for an institution to help her: first to stabilize her and afterwards to continue treatment. On a previous hospitalization she jumped from a second floor window and broke her back: “I wanted to get out.” There is a certain ambivalence in her treatment of her body, which she both worships and punishes, submitting to extenuating hours of exercise that leaves her exhausted. There is that quality of the mortification of the body which is often encountered in the clinic of anorexia. From her childhood the friend of the family told me that Andrea was left alone for long hours in her crib while her mother went out with Andrea’s older sister to luncheons or tea parties. The anxiety that inhabits Andrea is as touching as it is pathetic. There is an enormous demand to the Other to take care of her while at the same time she sabotages any help given.

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