In a Peer-to-Peer (P2P) file-sharing system, a node finds and retrieves its desired file. If multiple nodes cache the same file to provide others, we can achieve a dependable file-sharing system with low latency and high file availability. However, a node has to spend costs, e.g., processing load or storage capacity, on caching a file. Consequently, a node may selfishly behave and hesitate to c...

This paper discusses a propose cloud infrastructure that combines On-Demand allocation of resources with improved utilization, opportunistic provisioning of cycles from idle cloud nodes to other processes It provides fault tolerance while running on inexpensive commodity hardware, and it delivers high aggregate performance to a large number of clients.Because for cloud computing to avail all th...

We present Tightly Packed Tries (TPTs), a compact implementation of read-only, compressed trie structures with fast on-demand paging and short load times. We demonstrate the benefits of TPTs for storing n-gram back-off language models and phrase tables for statistical machine translation. Encoded as TPTs, these databases require less space than flat text file representations of the same data co...

The Hadoop Distributed File System (HDFS) is designed to store very large data sets reliably, and to stream those data sets at high bandwidth to user applications. In a large cluster, thousands of servers both host directly attached storage and execute user application tasks. By distributing storage and computation across many servers, the resource can grow with demand while remaining economica...

Cloud computing has emerged as one of the preferred platforms for on-demand, event-driven computing. However, literature on event-driven scientific modeling on the cloud is sparse. This paper presents our vision and architecture to provide a “Scientific Modeling as a Service”in an on-demand fashion. We choose one of the most widely used groundwater models, MODFLOW2000, from USGS to develop a Mo...

New audio services require editing tools for audio files. Indexing is a solution for fast access to specific information which could be speaker identity, location of speaker intervention on the file, topic identification. Good editing tools for text files have been available for many years and a solution for seamless navigation in an audio file could be the recognition of the content of the fil...

Re-finding files from a personal computer is a frequent demand to users. When encountered a difficult re-finding task, people may not recall the attributes used by conventional refinding methods, such as a file’s path, file name, keywords etc., the re-finding would fail. We proposed a method to support difficult re-finding tasks. By asking the user a list of questions about the target, such as ...

Peer-to-peer (P2P) content distribution systems such as file-sharing (e.g. BitTorrent), live streaming (e.g. PPLive) and video-on-demand (e.g. Joost) systems have become enormously popular on today’s Internet. These systems organize tens of thousands or even millioins of participating user hosts into a randomized mesh topology, where each user maintains connection with a subset of other peer us...

With the rapid advance of society, especially the development of computer technology, network technology and information technology, there is an increasing demand for systems that can provide secure data storage in a cost-effective manner. In this paper, we propose a prototype file system called EDFS (Encryption and De-duplication File System), which provides both data security and space effici...

background and aims. the manufacturing process of rotary ni-ti file can influence its resistance to fracture. the rotary profile (dentsply-maillefer, baillagues, switzerland) is manufactured by grinding mechanism whereas twisted file (sybron endo, usa) is manufactured with a twisting method. the purpose of this study was to comparatively evaluate the effect of manufacturing process on distortio...