In a complex, smart card based system this feature turns smart cards from passive datastorage devices into active computational units. In fact they contain a tamper resistant secure one-chip microcomputer able to execute various cryptographic functions. Moreover, their potential can be extended after the issuance of the card by uploading various new applications. However, the limited resources ...

We discuss the usage of the photonic nanojet to detect deeply subwavelength pits in a metal substrate for the purpose of high-density optical data storage. Three-dimensional finite-difference time-domain (FDTD) computational solutions of Maxwell’s equations are used to analyze and design the system. We find that nanojet-illuminated pits having lateral dimensions of only 100 150nm yield a 40-dB ...

Proper data items distribution may seriously improve the performance of processing in distributed environment. However, typical datastorage systems as well computational frameworks do not pay special attention to that aspect. In this paper author introduces two custom addressing methods for on example Scalable Distributed Two-Layer Datastore. The basic idea those is preserve stored same cluster...

Ever-Increasing Demands for More Storage Capacity Demand for DVDs continues to grow; DVD system sales are estimated to increase from 95 million units sold in 1998 to over 175 million units in 2001. This popularity is not surprising given that a DVD can hold enough data (up to 8.5 gigabytes on a dual layer disc) to play back an entire motion picture on a standard television with far greater clar...

15 Designing an optical data storage system involves both macroscopic components, such as lenses, filters, and polarizers, which are typically tens of thousands of wavelengths in size, as well as subwavelength-size data elements, gratings, nearfield antennas, and microcavities. Research and development of new approaches for high-density optical-disk data storage often requires detailed simulati...

Geodesists are, for the most part, a patient and hardworking lot. A day spent hiking to a distant peak, hours spent waiting for clouds to clear a lineof-sight between observation points, weeks spent moving methodically along a level line – such is the normal pulse of the geodetic profession. The fruits of such labors are all the more precious because they are so scarce. A good day spent with an...

introductiontoday, one of the most prominent health and environmental problems of cities is ascending trend of solidwastes. this must be managed and the institutionalization of phenomena such as recycling, composting, and soon from municipal solid waste must be taken into consideration. in iran, there is no essential management incollection, disposal and recycling of over 40 thousand tons of th...