The Geometer: A New Device for Recording Angles in Visual Surveys

The Geometer is a new handheld USB device that facilitates a relatively accurate measurement of the declination to a target with instantaneous recording of this and other data. The Geometer offers several advantages over traditional clinometers used in aerial surveys, including easier target pinpointing and tracking, more consistent angle measurements, and integration with software data collection packages. In this note we provide technical specifications for the device and its associated software, and describe a new aerial survey data collection programme that takes full advantage of the features of the Geometer. We have tested this device extensively during aerial surveys and highlight the utility of the hardware as well as ways in which the technology could be improved.

USB (Universal Serial Bus)

USB device dibagi menjadi beberapa golongan kelas seperti Human Interface Device, Communication Device, Mass Strorage Device, Audio Device, Printing Device, dan lain sebagainya. Windows sebagai system operasi telah mengembangkan dan meningkatkan pelayanan kepada berbagai macam USB Device, terutama pada HID class device. perkembangan terkahir menunjukan bahwa Windows telah menangani HID USB device dengan baik. Dengan menggunakan interface Universal Serial Bus, maka sebuah UPS dengan Class HID dan subclass Power Device memiliki peluang yang sangat besar untuk diinterfacekan dengan Power Management pada system windows.

An Authentication and Data Protection Scheme Research for Mass Storage Devices

Universal serial bus mass storage is a widely used storage device. In order to protect the user data security in USB storage devices, an effective authentication and data protection scheme is proposed. Using the attribute-based control technology, the security authentication of the USB device user is realized, and the privacy data fine-grained control of the USB device is realized. Security analysis shows that the scheme has strong security, it can resist replay attack, denial of service attack, the online password guessing attack, user impersonation attack, etc. Experimental performance analysis shows that the scheme has high efficiency in user registration, authentication and file decryption.