Now, what is the Real World? > 자유게시판

Dave is the conference chair for Graphing Social Patterns, and a co-chair for O'Reilly Web 2.0 Expo. BJ Fogg leads research and design at Stanford's Persuasive Technology Lab, which he founded in 1998 to investigate how computing products -- from web sites to mobile phone applications -- can motivate and persuade people. However, the design of the cylinder requires the use of special tools to manipulate the pins and apply torque. However, note that because the tumblers are a single piece, sawtooth raking, snap guns, and bump keys are not effective against them. If serrated bottom pins are used as well (as they are in, e.g., certain American brand padlocks), snap guns, bump keys, or sawtooth raking are likely the only picking techniques that will succeed, especially for the novice. However, because they jam when false set, locks with serrated pins tend to impression very well (impressioning is a decoding technique that produces a working key based on marks left on a progressively cut key blank). However, some tubular cylinders (e.g. the Ace-II lock and the tubular models of American-brand padlocks) are made to very tight tolerances and use mushroom, spool, and serrated security pins.

However, that is not to suggest that electronic locks are inherently more secure than their mechanical counterparts. In fact, master keyed pin stacks are easier to pick than those that are single-keyed; there are two chances to lift a cut to the shear line. For example, Mul-T-Lock cylinders use special "telescoping" pins that contain two independently keyed tumblers. These locks are no more or less inherently secure than standard pin tumbler locks, although the external exposure of their pins makes picking them (and designing sophisticated picking tools for them) somewhat simpler. Picking lever locks generally requires different tools from those used for pin tumbler locks, and high security lever locks often require specialized purpose-made tools. Some high security locks, such as those manufactured by Abloy and Abus, use round disk tumblers that are rotated into position by a specially designed key bitted with angled cuts corresponding to each tumbler. Other lock types include "European profile" cylinders, master keyed locks, master ring and SFIC cylinders, tubular pin tumbler locks, dimple-key pin tumbler locks, pin tumbler locks with secondary locking mechanisms, wafer tumbler locks, disk tumbler locks, lever tumbler locks, combination locks, and electronic locks. Master ring cylinders (which are no longer in common commercial production but were once marketed by Corbin) use this mechanism to provide independently-keyed master keying.

The lock mechanism can open when the notches on the disks are lined up at a particular rotation. While many of the principles of pin tumbler lock picking apply or can be adapted to other mechanical lock designs, a complete discussion of these locks and techniques for defeating them is beyond the scope of this document. It is always best to practice with your lock mounted to a door or wood platform, as they are here, or at least fixed in a vice. What’s the best way to improve my billiards skills? It is a measure of wealth in the same way as inches are measures of length and grams measures of weight. The basic principles of operation are essentially the same as those of the standard pin tumbler lock, except that the tumblers are exposed at the front of the cylinder and a round ("tubular") key is used. And so it is in our fundamental relationship to what we call the external world of nature, to the planet, to the solar system, to the galaxy, and to the whole universe: we do not exist without them any more than our heads exist without our feet, or our front without our back, or our inside without our outside.

So you ought to be grateful to the outside for having the privilege of being on the inside. And it’s therefore an envelope by means of which you communicate with the so-called outside world. But it isn’t its meaning, it’s its sound that is here important. Ilco replacement cylinders are inexpensive and a good compromise between quality and pick-ability for practice (that's what the training locks here are) and are available in a many different commonly-used keyways. Some wafter lock cylinders (especially certain Chicago-brand locks) are double bitted, with some wafers making contact with the key at the top of the keyway and others at the bottom. If the wafer is set too low by the key, it blocks rotation by extending out through the bottom of the plug, while if it is set too high, it extends out the top. These locks must be picked at both the top and the bottom, sometimes alternating between them. In a lock with six pin stacks with a uniform chance of a pin setting at either shear line, the probability of a picked lock actually opening is only 1/64. Picking techniques for these locks involve the use of special torque tools designed to put torque on only one of the two concentric plugs.

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