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The explosion of network bandwidth poses greatchallenges to data-plane flow processing. Due to the variable andpoor worst-case performance, naive hash table is incapable ofwire-speed processing. State-of-the-art schemes rely on multiplehash functions for enhanced load balancing to improve the worst-case performance. These schemes exploit the memory hierarchyand allocate compact on-chip data structures...
Help-seekers on community-based software help forums often face difficulty in composing queries or troubleshooting requests that bring immediate resolution, forcing help givers to request clarification that delays diagnosis. We investigate the characteristics of a forum post that trigger these requests for clarification from help givers (e.g., missing information, unclear goals, non-standard terminology)...
Pulsed laser diodes (PLDs) enable photoacoustic imaging with lower cost, increased portability, and higher frame rates compared to conventional Q-switched Nd:YAG lasers. However, the main disadvantage of the PLD is its low peak power, which necessitates averaging thousands of photoacoustic signals to achieve signal-to-noise ratios that are comparable to those produced by an Nd:YAG laser. The averaging...
Remote sensing technology, geospatial analysis and statistical analysis were integrated to link land use and water quality in four river basins of Beijing. Results showed that Beijing was in a rapid urbanization process from 1989 to 2008. At buffer zone scale, area of built-up area and transportation land were positively correlated with TN and NO3−-N, and negatively correlated with TP and NH4+-N;...
In this paper we design, implement and evaluate NameFilter, a two-stage Bloom filter-based scheme for Named Data Networking name lookup, in which the first stage determines the length of a name prefix, and the second stage looks up the prefix in a narrowed group of Bloom filters based on the results from the first stage. Moreover, we optimize the hash value calculation of name strings, as well as...
With the rapid growth of the Internet, the update messages in backbone routers become more and more frequent due to the ever-increasing dynamic changes on network topologies and new emerging functionalities of the Internet. In addition, update messages often come as a burst. Update action interrupts the packet lookup operation in the router's data plane, thus inefficient incremental update algorithm...
Flow-based packet processing exists widely in a variety of network applications, where a large sized flow table is built to keep the alive flow records. To accelerate the search speed of the flow table, numerous systems employ cache mechanism to track the most recently referenced flows. However, network traffic exhibits some different characteristics from the workload of the general computational...
Today's Internet applications exhibit increased diversity, while the Internet routers are still oblivious to this trend. To improve the end-to-end application QoS, one solution is to embed the application information explicitly in packet headers, but it will bring global changes. Another local solution is router-assisted traffic differentiation. To achieve this, the functionalities including packet...
In order to revealing the influence of nitrogen (N) on wetland plants, the hyperspectral traits of reed (Phragmites australis) were measured by FieldSpec®3. There were five N treatments, including 0, 1, 2, 5, and 20 mg/L. The hyperspectral information is useful to exhibit the characteristics of spectral reflectance in reed leaves under N influence. The results showed that the chlorophyll content of...
Wetland ecosystems have strong ability for carbon storage and fixation, and play important roles in the global carbon cycle. The accurate estimation of the leaf chlorophyll content is a significant foundation for researching wetland ecosystem cycle models. In this paper, the inversion of the leaf chlorophyll content was based on PROSPECT model from the physical mechanism angle. Leaf spectrum was simulated...
This study selected aquatic vegetation in BaiYangDian Wetland Nature Reserve in Hebei Province. Measuring the spectral reflectance of typical aquatic vegetation included stonewort, reed, lotus and typha, involved high-resolution GeoEye-1(GE) remote sensing image, based on spectral reflectance of different species simulating bands of GE, calculated the simulated bands, educed better bands or band combinations...
Based on two sets of TM data and CBERS data ( acquired in 1993 and 2008, respectively ), and by means of the techniques of remote sensing (RS), geographical information system (GIS), and landscape ecology, this paper studied the dynamic development of wetland landscape patterns from 1993 to 2008 in Daqing River downstream. The results showed that as the intensity of human activities gradually strengthened...
Beidagang wetland is an important infrastructure of Tianjin, possessing a variety of ecological environment and social service functions. However, Beidagang wetland ecosystem has been seriously degraded and its wetland functions have also been weakened under the influence of various factors. Research on the dynamic change characteristics of Beidagang wetland is of great significance to ameliorate...
The paper aimed at a new method based on Fuzzy Control and Lagrange Interpolation, to control and make decision of tobacco baking temperature. In the method, we calculated dry temperature and humidity the next scale time with Lagrange Interpolation through the dry temperature and humidity in the tobacco oven through the temperature of the sensors before the time, then control the degree of ventilation...
Terahertz wave generation and detection using air as both the terahertz wave emitter and sensor media through nonlinear optical processes similar to four-wave mixing (named terahertz air photonics) were introduced. Due to the unique features of this technique, it is possible to find applications for terahertz air photonics in remote sensing and identification of explosives by sending optical beams...
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