alveolar ridge is underdeveloped in ectodermal dysplasia (ed). the available treatment plans include fixed, removable or implant-supported prostheses, alone or in combination. a 5 year-old boy was referred for treatment to the department of prosthodontics, tehran university of medical sciences with the chief complaint of missing teeth. prosthodontic treatment was performed to improve masticatio...

DHT systems are structured overlay networks capable of using P2P resources as a scalable storage platform for very large data applications. However, their efficiency expects a level of uniformity in the association of data to index keys that is often not present in inverted indexes. Index data tends to follow non-uniform distributions, often power law distributions, creating intense local stora...

content discovery is one of the fundamental issues that determines the architecture and performance of content distribution networks based on peer-to-peer (p2p) networks. to administrate the costs and discoveries, peers of a p2p network communicate with each other by one or more overlay layers. the condition of node’s relations in overlay networks, have a great impact in efficiency of networks....

The demands of Internet applications have grown significantly in terms of required resources and types of services. Overlay networks have emerged to accommodate such applications. The performance of an overlay network is, however, highly dependent on its topology; keeping logical links in an overlay network from interfering with each other is crucial in achieving high throughput. In this thesis...

The World Wide Web is growing at such a pace that even the biggest centralized search engines are able to index only a small part of the available documents on the Internet. The decentralized structure, together with the features of self-organization and fault-tolerance, makes peerto-peer networking an effective information-sharing model; however, content searching still remains a serious chall...