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Medium 9781574414479

The Origin of Pigeons

Gibson Fay-LeBlanc University of North Texas Press PDF
Medium 9780596808327

19. A Communal Workshop or Doors That Close?

Andy Oram O'Reilly Media ePub

This chapter deals with an apparently simple question: what is the most convenient office space layout for collocated software teams? Intuitively, we know that space and the distance and accessibility between members of a software team are factors that set the tone for their projects. Cubicle farms, telecommuting, shared roomsthese and other arrangements encourage some kinds of interactions and disable others, and in the extreme case, remotely distributed teams restrict team interaction almost exclusively down to electronic communication. But we know that even when team members live in the same city and work in the same building, their office layout has an effect on their performance. So, how important is office space layout, really? And what does our current evidence tell us about the best ways to design our working space?

Let us begin with a straw man argument: money spent enhancing the workplace of software developers is money down the drain. Developers who insist on having individual offices with doors that close and phones that can be turned off are pampered prima donnas who cant ever be appeased. If you give each of them a nice office (and where will the space or the money for these offices even come from?), theyll start to complain about the kitchenette, or the lack of indoor bike parking, or the glare from the windows in their monitors. Inevitably theyll demand gourmet catering of organic, locally grown food, on-site massages, and ball pits, like those Google folks. And even if developers dont go that far, individual offices are expensive, far more expensive than cubicles. Why should an organization choose to spend its money on perks with only marginal and dubious productivity gainsespecially when most of its competitors arent doing it?

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Medium 9780596002558

5. Network Device Initialization

Christian Benvenuti O'Reilly Media ePub

The flexibility of modern operating systems introduces complexity into initialization . First, a device driver can be loaded as either a module or a static component of the kernel. Furthermore, devices can be present at boot time or inserted (and removed) at runtime: the latter type of device, called a hot-pluggable device, includes USB, PCI CardBus, IEEE 1394 (also called FireWire by Apple), and others. We'll see how hot-plugging affects what happens in both the kernel and the user space.

In this first chapter, we will cover:

A piece of the core networking code initialization.

The initialization of an NIC.

How an NIC uses interrupts, and how IRQ handlers can be allocated and released. We will also look at how drivers can share IRQs.

How the user can provide configuration parameters to device drivers loaded as modules.

Interaction between user space and kernel during device initialization and configuration. We will look at how the kernel can run a user-space helper to either load the correct device driver for an NIC or apply a user-space configuration. In particular, we will look at the Hotplug feature.

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Medium 9780253372048

10. On the Ghosts in Rutherfurd's Diffraction-Spectra

Peirce, Charles S. PDF


W R I T I N G S OF C H A R L E S S. P E I R C E , 1879-1884

On the Ghosts in Rutherfurd^s


P 134: American Journal of Mathematics

2 (1879): 330-47

Let there be a periodical irregularity in the ruling of a diffractionplate, so that the side of the rth slit nearest a fixed line of reference parallel to the ruling shall be distant from that line by

(r--ajw + esin(r0-i0J while the side of the same opening furthest from the line of reference is distant from it by

(r + —a)w + esin(r0 + —01).

This is supposing the opaque lines to have a constant breadth,

(1 -a)w.

Suppose the collimator and telescope of the spectrometer to be focused for parallel rays, and neglect the angular aperture of the slit.

Let the angle of incidence be /, and the angle of emergence j. Write v= sin/ — sinj.

Then the ray which strikes the gitter at a distance % from the line of reference is longer than that which passes through the line of reference by vx. Consequently, the resultant oscillation from the r"1 slit will be

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Medium 9780890515792

11. Was There Death Before Adam Sinned?

Master Books ePub


Was There Death Before Adam Sinned?

Ken Ham

Annie’s cruel death destroyed Charles’s tatters of beliefs in a moral, just universe. Later he would say that this period chimed the final death-knell for his Christianity. Charles [Darwin] now took his stand as an unbeliever."[1]

When Charles Darwin wrote his famous book On the Origin of Species, he was in essence writing a history concerning death. In the conclusion of the chapter entitled "On the Imperfections of the Geological Record," Darwin wrote, "Thus, from the war of nature, from famine and death, the most exalted object which we are capable of conceiving, namely, the production of the higher animals, directly follows."[2]

From his evolutionary perspective on the origin of life, Darwin recognized that death had to be a permanent part of the world. Undoubtedly, he struggled with this issue as he sought to reconcile some sort of belief in God with the death and suffering he observed all around him, and which he believed had gone on for millions of years.

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