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We present Hammer, a real-world, end-to-end network traffic simulator, capable of simulating complex and dynamic network, user and server behaviors. The focus of this tool is to primarily facilitate investigations related to product stability, for instance different aspects of capacity, longevity, memory leaks, cores and also handle customer content testing that will reveal the behavior of the device...
Some individuals with chronic combat-related posttraumatic stress disorder do not benefit from standard psychotherapies and often drop out of treatment. Innovative treatment techniques, such as virtual-reality, may be useful to help address treatment goals by promoting presence and overcoming cognitive avoidance to improve ability to reconsolidate the traumatic memory. This pilot study examined the...
Today's energy consumption and energy demand is increasing. That is particularly true in case of electric power consumption. The electric power is transferred from the power plants to cities and other consumers through the transmission network. The transmission lines should operate on the designed voltage and ampacity of the line, but due to the increased demands, some of the lines are already operating...
DC capacitors in power electronic converters are a major constraint on improvement of power density as well as reliability. In this paper, according to the degradation data of electrolytic capacitors through the accelerated test, the time-to-failure of the capacitor cell is acquired and it can be further extended to lower stress levels. Then, in a case study of a fuel cell backup power application,...
Personality is the defining essence of an individual as it guides the way we think, act and interpret external stimuli. Classification of personality is important as it can serves as a framework in the job assignment task, particularly, in the high risk job including the Police Force. There are many attributes of individual traits but not all of them can be used to indicate individual personality...
System-in-Package (SiP) is becoming more and more important in integrating functionality while reducing final product form factors and cost. This is particularly true for mobile applications where continued effort to achieve ever thinning products is continuously pushing development of new materials, components and assembly technologies. This presentation focuses on a SiP flip chip (FC) pad design...
Resin cracking is a common failure mechanism in electronic packaging using organic chip carrier. Chip carrier made of organic material has been industry standard for the past decade as they provide significant advantages over the ceramic dielectric-based predecessors in manufacturing cost and electrical performance. However, the CTE mismatch between the silicon chip and the organic laminate leads...
High specific power electric machines are crucial to enabling electric aircraft. In order to meet this need, a high specific power electric machine with an unconventional topology is being developed. The topology creates mechanical challenges including expansion due to high speed, and thin radial builds that affect rotordynamics. These challenges have been addressed in the analytical design and a...
The trend towards multi-die flip chip packaging favors the incorporation of a qualified manufacturingcompatible rework process to remove and replace individual defective die. Inherent to the rework process is an electrical verification step that effectively identifies the defective device without compromising the integrity of an otherwise perfectly functional device. Unfortunately, the very feature...
High current capability, good integration in urban area and zero external magnetic field are advantages of HTS cables that make them interesting for implementation in the Netherlands. So far experience with HTS cable projects is good, but still limited. Yet there is a need for a proper testing practice. Due to limited operational experience, various aspects remain to be studied. This paper focuses...
The aim of the study was to evaluate the repeatability of the human breath acetone concentration during stress testing. Eight healthy men aged 19 to 34 years were tested (mean age 26.9 ± 1.4). Subjects performed a stress testing on cycle ergometer at twice-weekly intervals. As a result of processing the obtained data, a good similarity between the initial and repeated curves of the acetone concentration...
An automatic, defect-oriented method is proposed for activating latent defects in analog and mixed-signal integrated circuits. Based on the topology modification technique, added stress transistors generate voltage stress that activates these latent defects. This contrasts with burn-in testing which uses increased temperatures as a fault activation mechanism. Moreover, this Design-for-Testability...
Stress concentration is a serious threat to the safety of pipeline. It is great significant to security management of oil-gas pipeline that the stress concentration can be tested and evaluated. The relation model between stress and coercive force is established based on hysteresis of ferromagnetic material. Through tensile test, stress damage critical state parameters are obtained, the parameter ranges...
The effects of temperature and tensile velocity on the mechanical properties and mechanics of Au/Cu/Au/Cu nanofilms under tensile testing are studied using molecular dynamics simulations. The simulation results show that at the initial tensile deformation, dislocations nucleate at layer interfaces, propagate along close-packed plane {111} toward the interior of the film, and are then terminated by...
When exposed to a temperature changing environment, solder joints in electronic assemblies are subjected to cyclic thermal-mechanical loading due to the mismatches in coefficients of thermal expansion (CTE) of the different assembly materials. Eventually, the cyclic loading can result in fatigue failure of solder joints, which is one of the common failure modes in electronic packaging. While it has...
This paper presents the design of a flexure-based precision positioning micro-motion stage system with constant output force. The stage mechanism is devised using folded leaf flexure (FLF) to achieve positive-stiffness structure. Bistable beams are employed to design negative-stiffness structure by using their buckling characteristics. Two bistable beams and two FLFs are combined together as a zero-stiffness...
The use of additive manufacturing (AM) is expanding rapidly; however, the mechanical behavior of printing materials has yet to be fully elucidated. In this study, we examined UV-cured photopolymers designed for use in PolyJet systems. We tested the shore hardness and impact characteristics of the photopolymer in accordance with ASTM D2240-15 and ASTM D256-10, respectively. The coefficient of variance...
We have produced a new, automated Maszara testing tool. This tool can be used to measure the bond strength across the entire interface of a bonded wafer pair and produce a bond strength map. The tool can also be used for IR inspection.
Concurrent data structures are often tested under stress to detect bugs that can only be exposed by some rare interleavings of instructions. A typical stress test for a concurrent data structure creates a number of threads that repeatedly invoke methods of the target data structure. After a failure is detected by a stress test, developers need to localize the fault causing the failure. However, the...
An overview of reliability engineering is presented here to serve as an introductory piece for some, or perhaps as a refresher. Much of the discussion here is general in coverage, and may suggest topics for further investigation.
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