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Node.js becomes increasingly popular in building server-side JavaScript applications. It adopts an event-driven model, which supports asynchronous I/O and non-deterministic event processing. This asynchrony and non-determinism can introduce intricate concurrency bugs, and leads to unpredictable behaviors. An in-depth understanding of real world concurrency bugs in Node.js applications will significantly...
Unintended smartphone rebooting and unexpected shutdown (due to reasons like battery run outs, overheating, or automatic app upgrades) is annoying. What can be even worse is that a phone user commonly has to restart, from the very beginning, the apps he or she is using when the phone gets rebooted, because all the app states would be lost, especially when the number of apps in use is large. Hence,...
A design scheme of piezoelectric MEMS vibration platform for in-situ self-calibration of accelerometer is proposed in this paper. On the basis of theoretical deduction, the available g-factor of the vibration platform is analyzed. Taking fabrication limitations into consideration, the characteristics optimization of the vibration platform using PZT-4 is carried out by evaluating the impact on performance...
Modern software systems are becoming increasingly complex, relying on a lot of third-party library support. Library behaviors are hence an integral part of software behaviors. Analyzing them is as important as analyzing the software itself. However, analyzing libraries is highly challenging due to the lack of source code, implementation in different languages, and complex optimizations. We observe...
Silver sinter technology is a very promising lead free interconnection method with high operating temperature, high thermal and electrical conductivity. In high power semiconductor modules the die attach material connects the die to the insulating substrate. These die attach materials need to be optimized to provide low electrical resistance and high thermal conductivity. Various silver sinter materials,...
Content Delivery Network (CDN) is an effective solution to offer reliable and efficient content provisioning across the Internet. In order to ensure the service experience, it is critical to adopt efficient routing and server selection techniques in CDN. However, traditional CDN is unable to possess global knowledge of whole network and therefore lacks the ability to dynamically control routing and...
A triple-band bandpass filter with good selectivity based on asymmetric square ring loaded resonator (ASRLR) is proposed in this paper. The even- and odd-mode method is applied to investigate the resonant characteristic of the proposed triple-mode ASRLR. The 50-Ω tapped line is applied to design the I/O ports. The operating bands of the designed tri-band BPF are located at 1.57 GHz (GPS application),...
The electromagnetic pulse, such as high-altitude electromagnetic pulse and lighting electromagnetic pulse is described extensively by the double exponential function with characteristic parameters k,EP, α and β. For the conductive protection design of long lines, the highest and lowest frequencies of EMP energy spectrum, ƒh and ƒL, are critical parameters. Unfortunately, they cannot be obtained directly...
In GNSS/INS navigation integrated systems, the selection of inertial sensors is a factor which can impact their system performances implicitly. Unfortunately, the research of the relationship between the inertial sensor errors and the navigation performances is not sufficient yet. In this case, the mathematical relationship between the sensor quality and the INS (Inertial Navigation System) performance...
Most global navigation satellite system (GNSS) receivers cannot work in high dynamic scenarios because of poor navigation satellite acquisition in these environments. Hence, inertial navigation system (INS) is used to aid the GNSS signal acquisition and improve the acquisition capability of the receivers. In this paper, an ultra-tight integration system using the low-cost IMU is proposed to achieve...
In this paper, a compact dual-band high-temperature superconducting (HTS) bandpass filter is demonstrated for observing the nonlinear phenomena. Various theoretical models are applied to investigate the equivalent circuits of the proposed superconducting transmission line. To verify this methodology, the measured temperature dependence (from 65 K to 100 K) and input-power dependence(from −6 to 9 dBm)...
A compact triple-band high temperature superconducting (HTS) filter using coupled-line stepped-impedance-resonator (C-SIR) has been proposed in this paper. The resonant characteristics of the C-SIR are investigated by the even/odd-mode analysis. Owing to the coupled-line feed-lines structure, multiple transmission zeros are created to improve the selectivity of the filter. The resultant filter shows...
In this paper, the parameters effect on resonant frequency of MEMS piezoelectric cantilever beam is studied by FEA simulation, which is aimed to provide estimation of the frequency error using simple beam formula for piezoelectric cantilever beam based vibration energy harvester. In the simulation, piezoelectric vibration energy harvester is simplified to a thin silicon cantilever beam with a proof...
In this paper, the electrode effects on mass sensitivity of GaN thin film bulk acoustic wave resonator (FBAR) sensors have been studied. The equation of electric impedance of FBARs with structure of mass sensitive layer/electrode/GaN/electrode has been derived by one dimensional transmission line model for frequency calculation. In the simulation, to produce shear mode acoustic 2µm GaN with 42.8°...
In order to realize the pressure energy harvesting of pneumatic system, a novel pneumatic-piezoelectric generator is proposed in this paper. The bending deformation of piezoelectric plate is induced under the impact of air supply pressure. The transformation from pressure energy to electric energy is realized based on direct piezoelectric effect. The simulation analysis of flow field distribution...
At first, two innovative families of fuzzy implications are introduced. One is called an Mf-implication defined by a strictly decreasing function such that its range belongs to an Abel semigroup, the other is said to be an M-implication. After this, several proposed properties of Mf-implications and M-implications are studied. Finally, it is shown that Mf-implications and M-implications are really...
Distributivity was proposed about fifty years ago and it has been studied for several well-known operations, such as, uninorms and nullnorms, specially for t-norms and t-conorms. Over there, we prepare to continue to investigate the same topic as the above by focusing on semi-t-operators, which are generalization of t-operators by omitting commutativity. In fact, this is also the future work recommended...
Frequent Item set Mining (FIM) is a classic data mining topic with many real world applications such as market basket analysis. Many algorithms including Apriori, FP-Growth, and Eclat were proposed in the FIM field. As the dataset size grows, researchers have proposed MapReduce version of FIM algorithms to meet the big data challenge. This paper proposes new improvements to the MapReduce implementation...
QoS-aware service selection is a kind of classical problem in service computing and has been widely studied. A common assumption made by the majority of existing solutions is that the candidate service will report its true QoS value honestly. However, this may not be true in open Internet environments since some service providers are selfish who wants to get more profits when providing services. Instead...
Solar energy is renewable energy which can be used in the drying. From the view of agricultural and sideline products dry demand, a solar dry device designed using solar energy is demonstrated. The drying principle of the device and its mechanical structure are focused on, as well as the circuit hardware is also designed. The drying result using of this device for agricultural and sideline products...
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