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This paper presents a comparative study of different frequency sequences which are used for Very Long Baseline Interferometry (VLBI) Bandwidth Synthesis (BWS) in recent astrometric and geodetic VLBI campaigns. The Peak Sidelobe (PS) level of Delay Resolution Function (DRF), Normalized Effective Bandwidth (NEB) and Frequency Ratio (FR) are defined as the metrics for comparison. Considering the case...
This paper presents the algorithm and results of designing optimal frequency sequences for Very Long Baseline Interferometry (VLBI) Bandwidth Synthesis (BWS) in VLBI experiments conducted jointly by Chinese Deep Space Stations (CDSS) and Chinese VLBI Stations (CVS). The optimization algorithm based on global search is intended to get lower peak side lobe level of delay resolution function and larger...
This paper presents instrumentations for high throughput single ion channel recording array used for proteomics. The instrumentations incorporates two-stage amplifier using shared operational transconductance amplifier structure. The proposed sensor frontend reduces power consumption and area of circuit without any performance degradations in terms of bandwidth and noise. Two compact, low noise, low...
Cloud storage has become a active field of research with the development of Internet services. However, the corresponding billing system always cost users more money because of that the billing system is not suitable for the users' realistic application. To solve this problem, the author studied the existing billing system, analyzed the features of users and cloud storage providers, and proposed a...
To alleviate the server bandwidth cost of online video sharing services, p2p delivering has been suggested as an effective tool with success already seen in accelerating individual sites. The numerous video sharing sites existed however call for a universal solution that provides transparent p2p acceleration beyond ad hoc solutions. More importantly, only a universal platform can fully explore the...
Recent years have witnessed an explosion of online video sharing as a new killer Internet application. Yet, given limited network and server resources, user experience with existing video sharing sites are far from being satisfactory. To alleviate the bottleneck, peer-to-peer delivering has been suggested as an effective tool with success already seen in accelerating individual sites. The numerous...
Unlike P2P-based live streaming, P2P-based video-on-demand (P2P-VoD) has asynchrony in sharing video content among users. To compensate, each peer is expected to contribute a fixed amount of disk space, which forms a distributed P2P storage system. How to regulate this storage system is undoubtedly one of the most important strategies in P2P-VoD systems. PPLive, a large-scale P2P-VoD system, has made...
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