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Based on deep analysis and research on the Lucene index mechanism, the paper uses memory as buffer to construct index file, combined with disk index storage, and carries on the collaborative index, forming an extensible search engine solution, which greatly alleviates the bottleneck problem of building index to search.
SRAM is vulnerable to device-to-device variation (DDV), since it uses minimum-sized devices and requires device matching. In addition to the as-fabricated DDV at time-zero, aging induces a time-dependent DDV (TDDV). Bias temperature instability (BTI) is a dominant aging process. A number of techniques have been developed to characterize the BTI, including the conventional pulse-\(I\) –\(V\) , random...
In this paper, a study on frequency interpolation algorithms of method of moments (MoM) impedance matrices is discussed in detail, which is successfully applied into the full-wave analysis of a microstrip patch antenna in a relatively wide band. By using Lagrange interpolation scheme in an adaptive system, two interpolating rules are realized and their accuracies are defined by Frobenius norms of...
Chaff jamming is an important measure of antiradar, the paper carried out analysis of chaff's jamming efficiency based on the rainy day. Used chaff cloud's influence on radar wave attenuation in different rainfall rate to make mathematical models, and have done some research on chaff's jamming efficiency in different radar frequency. The result showed that the rain will enhance the effect of chaff...
The development of technology accelerates the life cycle of products and the rate of product substitution. Dynamic random access memory (DRAM), which is characterized by generation substitution, is an innovation in technology development that enhances competitive capabilities. In this study of the DRAM industry, the Gompertz model, traditional logistic growth model, Norton and Bass model, and fuzzy...
Anomaly detection is an essential functionality of Wireless Sensor Networks (WSNs) due to their complex behaviors and the wireless dynamics. In dynamic WSNs, many characteristics such as network topology, locations of sensor nodes, change frequently over time. We observe that indirect correlations among multiple attributes of a sensor node can be utilized to capture and model the historical behaviors...
Now high-throughput sequencing technologies can yield a huge volume of sequence data with affordable price, the explosion rate of sequence data is outpacing the performance improvement of CPU, which means trivial sequence analysis task may challenge existing serial programs running purely on CPU. This paper depicts a highly parallel sequence translation program running on a commodity multiprocessor...
We present a holistic dynamic linking and loading mechanism in networked embedded systems. Our design and implementation are guided by four requirements, which are to provide (i) minimal code size (ii) efficient execution and loading speed (iii) portable design (iv) isolated kernel/application development. First, we develop a tool to minimize the standard ELF format via many techniques in order to...
Technology scaling in sub-100 nm regime has significantly shrunk the SRAM stability margins in data retention, read and write operations. Conventional static noise margins (SNMs) are unable to capture nonlinear cell dynamics and become inappropriate for state-of-the-art SRAMs with shrinking access time and/or advanced dynamic read-write-assist circuits. Using the insights gained from rigorous nonlinear...
Data memory has been a very scarce resource in sensor networks. Thus, its efficient utilization is necessary. There cannot exist a memory allocator that will deliver best performance and least memory consumption for all programs, but a particular allocator that works best for a particular program is possible. In this paper we present SDMA, a simulation-driven dynamic memory allocator for wireless...
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