AT&T (Israel)

The purpose of this paper is to present radiological findings of a short-term (8 to 10 months) computerized tomography (CT) follow-up study on 1-stage maxillary sinus lift cases. Pre- and postoperative dental CT scans of 21 patients (24 sinuses) after sinus lift procedures were compared. CT scans were used to assess newly formed bone and its interface with the implants, condition of the sinus membrane, evidence of buccal window cortication, and presence of any sinus pathology. Of the 57 implants placed, 28 had bone fully covering the implant on all sides which did not extend above the apical portion; 20 had bone fully covering the implant which did extend above the apex; and 9 exhibited incomplete bone coverage. All implants supported a fixed ceramo-metal prosthesis, and no implant failures were recorded after 3 years of follow-up. There was evidence of cortication of the buccal window in 10 sinuses; in the 14 remaining sinuses, bone consolidation on the buccal aspect was evident, but no evidence of cortication was seen. All sinuses healed without complications or clinical signs of sinusitis. In 11 sinuses, no changes in membrane thickness were noted. Membrane thickness decreased postoperatively in 12 sinuses, and in one, there was evidence of membrane thickening. Bone cortication in the anterior wall window may serve as an indicator for the remodeling status of the entire graft. Postoperative findings showed a significant improvement in overall membrane thickness. No clinical symptoms of sinusitis were evident, indicating that sinus lift procedures can be considered safe and do not predispose the sinus to acute or chronic sinusitis.

We consider the problem of implementing atomic operations on multiple shared memory objects, in systems which directly support only single-object atomic operations.

A multi-ray model was developed to predict the relative strength and DOA of the rays propagating in a 'regular' urban environment. Field measurements have verified the validity of the model. There is a clear advantage to using a directional antenna at the mobile terminal for a B-CDMA spread spectrum signal at 1.9 GHz. To be able to realize the full advantage of the directional antenna, one must estimate the DOA. Field data shows an improvement of 6.5 to 7.5 dB for an 8.0 dBi directional antenna as compared to a 0.0 dBi omnidirectional antenna. This is contrary to previously reported results (that were based on tests of FM signals in a macro-cellular environment). The directional antenna helps in reducing the fade depth and duration, and improves SNR when pointed in the right direction. Allocation of higher frequencies (1.9 GHz) for PCS, enables the use of a compact, yet a highly directional antenna at the mobile. The 6 GHz band is being investigated by AT&T for future PCS applications. Closing the link at 6 GHz may require the use of a directional antenna. The paper proves that it may be advantageous, and proposes a model that may be used to optimize other system parameters.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

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