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on the template size A typical smart card can have from 8K of memory up to more expensive ones that can hold 64K or more Generally, the smart card in most applications is used to hold other information, including username/passwords for various systems, digital certificates, and more As a result, for the cheaper smart cards, referred to as memory cards, the maximum space available for template storage is about 2K 4K Portable template storage generally is the best method of maintaining individual privacy since the template does not have to also reside in an online master database One key difference between the cheaper smart cards and those more expensive is the ability for them to encrypt data Generally, more expensive cards that can encrypt the template are necessary since the loss of the card itself could force a compromise of the biometric system This option, while maintaining a high level of privacy, leaves open the greatest user support issues Should the card be lost, damaged, or stolen a number of security issues are raised Replacement programs and reenrollment procedures also need to be developed for the cards The other key aspect of template storage is that the template must be stored in a very secure manner If the template could be altered or somehow manipulated, it would compromise the entire system This security issue is perhaps the weakest aspect of a biometric system since usually all of the templates are stored in a single database This honey pot must be well protected Some systems will store templates locally (directly on the device), while others will interact over a network to a central server Other factors also must be considered, such as whether the templates will be stored in a dedicated database or in a multi-use database A multi-use database may contain additional information about the user, such as her employee number, social security number, and other personal identification information Risk of stolen identity increases as more information is tied to the biometric template One challenge related to interoperability is that templates are usually stored in proprietary formats, unique to each biometric vendor This absence of uniform standards poses a challenge when a company attempts to require multiple biometric devices or merges heterogeneous biometric systems 10 discusses this issue.

Figure 1414 shows a ball and groove follower cam mechanism that is used in a lightly loaded mechanism such as a sewing machine at speeds from 2000 to 3000 rpm The cam groove C is a closed track cam utilizing a ball follower A round arm A has a sliding t in the hole of the ball and is fastened to shaft D, which is the output shaft The ball follower runs in the groove of the closed track follower, imparting oscillating motion to output member A and shaft D This cam follower mechanism is easy to fabricate

B.2.1

Many hand tools provide mechanical advantage Examples are pliers, scissors, car jacks, and bolt cutters They all have a design restriction in that the amount of leverage is dependent on the length of the handles A spiral cam can be a proper choice to provide the nec-

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Repository management is a key issue that affects biometric system architecture and design Earlier, we discussed the need for secure storage of templates and alternatives to network storage For large-scale projects however, a comprehensive repository system must be built, taking into account the following considerations:

FIGURE 1415 Spiral-cam cutting mechanism (rachet driven)

essary mechanical advantage in which a small force rotates the cam a large distance to provide a much larger force Figure 1415 shows a schematic of a spiral-cam cutting mechanism doubled with a ratchet system, which is designed for three revolutions of the spiral The frame of the tool consists of one edge of the cutting tool and one handle Near the center of the tool, the spiral cam is ratcheted to the frame The second handle is in turn ratcheted to this Above the spiral cam is a pin joint to which the other cutting edge is fastened This cutting tool is guided by a follower in the cam track A force analysis of the cam provides interesting mechanical advantage characteristics Simple lever devices can be modi ed with spiral cams of various shapes to enhance the operating characteristics of the tool It can be shown that for a simple wire cutting device, mechanical advantage values of 300 for small hand tools can be produced In addition to hand tools a spiral cam can lend itself to more elaborate devices such as jacks, positioners, and crimpers

Microsoft s Unit Testing Framework (also known as MSTest) comes bundled with any version of Visual Studio .NET 2008 professional or above. It includes basic features that are similar to NUnit, but it runs a little slower. The upcoming versions of Visual Studio (2010) will add a lot of power to this framework, but you can use it today as easily as NUnit. One big problem with this framework is that it s not as easily extensible as the other testing frameworks. To see how cumbersome it is to add a simple attribute, see the discussion of YUnit on MSDN at http:// code.msdn.microsoft.com/yunit. One big plus for this framework is that it s integrated into the Visual Studio Team System tool suite and provides good reporting, coverage, and build automation out of the box. If your company uses Team System, I highly suggest using MSTest as your test framework because of the good integration possibilities. You can get MSTest with Visual Studio.

Sufficient capacity for the maximum target user population (number of records) Auto population of templates (from other data sources) Data structure construction (used for creating queries and manual research into the database)

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