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To ensure the quality of Android applications, many automatic test case generation techniques have been proposed. Among them, the Monkey fuzz testing tool and its variants are simple, effective and widely applicable. However, one major drawback of those Monkey tools is that they often generate many events in a failure-inducing input trace, which makes the follow-up debugging activities hard to apply...
Many studies have shown that deep learning outperforms traditional machine learning methods in many applications. To prevent overfitting, a huge number of training samples is usually required in training process of deep learning. However, collecting such a large dataset is time-consumed and costly. Recently, several methods have been proposed to effectively learn the models with a limited number of...
Many dynamic hybrid race detectors aim at detecting violations of the lockset discipline in execution traces of multithreaded programs. They are designed to abstract memory accesses appearing in traces as contexts. Nonetheless, they keep these contexts in different extents and partition the sets of contexts into equivalent classes of different granularity. In our case study, we compare three detectors...
Driven by the need to know which spectrum-based fault localization techniques are more effective in locating faults, many studies have sought to compare the accuracy of different formulas used in these techniques, resulting in findings of both theoretical and empirical accuracy relations of these formulas. Theoretical accuracy relations are independent of the specific programs and other settings involved,...
We demonstrate scaled high-Ge-content (HGC) strained SiGe pMOS FinFETs with very high short channel (SC) performance using a Replacement High-K/Metal Gate (RMG) flow, for the first time. A novel RMG gate stack process was introduced to create Ge-free interface-layer (IL) with excellent reliability and sub-threshold swing (SS) as low as 62mV/dec, the best reported to date for Si-cap-free SiGe FinFETs...
We report the fabrication of short-channel FinFETs on InGaAs-on-silicon wafers using the aspect ratio trapping (ART) technique. We demonstrate excellent short-channel control down to 20 nm gate length due to scaled fin width down to 9 nm and reduction of parasitic bipolar effect (PBE). PBE that plagues III-V NFETs with gate-all-around (GAA) or III-V-on-insulator (III-V-OI) structures can be significantly...
Operation of SiC MOSFETs beyond 300°C opens up opportunities for a wide range of CMOS based digital and analogue applications. However the majority of the literature focuses only on the optimization of a single type of MOS device (either PMOS or more commonly NMOS) and there is a lack of a comprehensive study describing the challenge of optimizing CMOS devices. This study reports on the impact of...
We propose three algorithms as approximations to k-means++ with complexity only O(nk) which is independent of D with n being the number of data points, k being the number of clusters and D the dimensionality. By combining random projection and k-means++, the proposed algorithm still enjoying the lower-bounded performance by results given for k-means++, on the other hand, the errors introduced by the...
We present the first comprehensive study of symmetric lateral bipolar transistors built on Semiconductor-On-Insulator (S-OI) wafers with CMOS-like process. Record-high IC > 3 mA/μm is demonstrated. Reduced voltage operation can be achieved with small-bandgap semiconductor materials such as SiGe and Ge. Base current analysis and emitter engineering provide understanding of device physics and pathways...
The modal analysis method of a probe-fed, cavity-backed patch element in a unit cell is presented. This type of element is considered for use in an electronically scanned horizontally polarized X-band aperture operating from 9.7 GHz to 10.3 GHz and with an azimuth scan of ±45°. The scanned characteristics of the element are found to be well suited for the intended application.
The measured performance of a dual polarized array of ridge elements arranged in a square egg-crate lattice is presented. The array is designed to operate over a 4:1 frequency band (4.5–18 GHz), within a conical scan range of ± 22.5° and with a scanned VSWR less than 2. The test results show that these electrical characteristics have been achieved without any resonances or deep dropouts. Further,...
A common but difficult antenna requirement for medium earth orbit (MEO) communication satellite is the generation of simultaneous multiple beams over a wide coverage area. The beams should be highly overlapped in order to provide high coverage gain but yet with sufficient decay in the sidelobes to yield the necessary isolation between every other beam. An efficient antenna solution to this problem...
Advanced Satcom Satellites require uplink (30 GHz) and downlink (20 GHz) antennas providing regional earth coverage (Canada, CONUS, Alaska, Hawaii and Puerto Rico) using high gain multiple overlapping spot beams. The antenna coverage with 128 beams that are arranged in a hexagonal grid fashion is shown in Figure 1. Critical antenna design parameters required for this system are very low scan loss...
The development of a very wideband balanced stripline printed dipole array placed above a conducting ground plane, as shown in Fig. 1, is discussed in this paper. A balanced printed dipole has its arms printed on the top and bottom conducting plane of a thin substrate mounted normal to the array ground plane. An integrated matching network forms the centre conductor of the stripline feed. The arms...
The dielectric lens is a viable alternative to the reflector as the main mission antenna to provide communication satellite services in the millimetre wave band. Of the various types of dielectric lenses available, the thin spherical lens is particularly suited for satellite usage. Its advantages are many, including low weight obtained through zoning, centre feeding with no blockage, circular symmetry...
This paper deals with the internal scattering of an open cylinder that is illuminated by an incident plane wave. Three different types of terminations for the cylinder are considered: a short-circuit flat plate, a plug represented by a section of coaxial guide with a short-circuit plate, and a set of coplanar blades. In the last termination, energy transmitted through the gaps in the blades is absorbed...
Based on the Flow Authority model, we propose the VSM (Vector-based Spread Maximization) algorithm that estimates the SSS (Steady-state Spread) objective function for multiple seeds based on SSS values of individual seeds to reduce computation. Based on three real-world large sparse networks, our empirical results indicate that VSM is more effective than two existing algorithms, and two orders of...
This paper presents a current feedback buffer based output capacitorless low-dropout (OCL-LDO) regulator. By incorporating the weighted current feedback (WCF) circuit technique in a simplified buffer-based regulator architectural design, it can provide a fast response with efficient transient figure-of-merit (FOM) for wide current (IL) and capacitive (CL) load range. Validated in a UMC 65-nm CMOS...
A low energy-noise switched-capacitor (SC) interface with low offset for resistive bridge sensor in 65nm CMOS technology is presented. It converts the resistance imbalance of the bridge sensor into a saw-tooth frequency using current-mode sensing technique. Auto-zero (AZ) technique incorporating with ping-pong architecture is proposed to reduce the offset and low-frequency noise of the amplifier....
A novel approach of identifying case role is proposed. The approach makes use of an attributed string matching technique which takes full advantage of a huge number of sentence patterns in a Treebank. Based on the syntactic and semantic tags encoded in the Treebank, the approach goes beyond shallow parsing to a deeper level of language understanding, while preserving robustness, without being bogged...
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